GraphPad Software

FAQ Index When starting Prism on a network, I get an incorrect message that says "all licenses are in use". (1)
PDF files of GraphPad help and manuals(2)
When I install Prism 2 for Mac, why does the system keep asking me to swap disks? (4)
How can I replace a damaged CD (or disks)?(5)
How do I uninstall Prism?(6)
Why is my project file sometimes opened in an older version of Prism instead of the current version? (7)
Prism (or InStat or StatMate) won't accept my serial number, or name, or institution name.(8)
What does a "CRC error" message mean? (9)
I'm installing Prism on a network. How can I write-protect the Prism folder? (10)
Why can't I access Help in Prism? (12)
Does GraphPad offer training classes in Prism? (13)
How can I choose colors and fill patterns for individual bars in a bar graph?(15)
How do I reverse an axis?(16)
Why are my data plotted with a connecting line, but no symbols?(17)
Exporting a Prism graph or layout as a high-resolution TIFF image?(18)
Using Prism 2 Mac, why do I see a gray background behind Y axis titles (or double images)?(20)
How can I plot data with a point-to-point line, but not have lines through the data points on the legend?(22)
How can I control which graph symbols or lines overlie--and therefore cover up--those for other data sets?(23)
Why does Prism sometimes label every value on a log10 axis (1, 10, 100..), and other times every other value (1, 100, 10000..)?(24)
How can I put graphs from two different files onto the same page layout?(25)
Prism 3 (Windows) used to work fine, but now it crashes repeatedly. Why? (26)
Why does Prism 3 (Windows) freeze or crash when I work on a graph or layout? (29)
Why does Prism (versions 3 and earlier for Windows) sometimes crash when I try to open a file, create a new file, or save a file? (30)
Why does Prism display "interrupted" rather than results of a curve fit?(31)
When I click the option box to compare two equations, why don't I see radiobuttons to select equation 1 and 2?(32)
How can I obtain linear regression results from Prism with only two XY pairs? (33)
Why does Prism report the standard error for logEC50, but not for the EC50 itself, when it fits dose-response curves?(34)
Where are my standard curve results?(35)
Why is my regression line too short (or too long)?(36)
How can I make each point on my graph a different color or shape, but fit a curve to all the points?(37)
Can Prism create Receiver-Operator Curves?(39)
Interpolating from several standard curves on one Prism table.(42)
Can Prism perform sample size and power calculations? (43)
Ambiguities in computing the median survival time.(44)
Where are the results of my analysis? (45)
How can Prism do two-way ANOVA with more than 256 replicates per group?(46)
How do I know which version I have? (48)
Which are the current versions of Prism? How can I update or upgrade? (49)
After I copy a Prism graph or layout, nothing will paste. Using the Send-to-Word or Send-to-Powerpoint buttons don't work.(51)
Why are X values left-justified, rather than right-justified as usual?(52)
How can I create a template including more than one data table? Or a template that includes a layout?(53)
Using Prism 3.00, the File..Merge command is missing.(54)
Why does my Prism file have the extension .pz$ or .pzf$ rather than .pzf?(55)
Troubleshooting pasting Prism tables into Word(57)
What to do when Prism won't open a Prism file.(58)
Can files I created with one version of Prism be opened by another?(60)
Can Prism Mac and Prism Windows read each other's files?(61)
Why won't Prism import all my data?(62)
Prism gives an "unable to save file..." "could not save" or "cannot replace file" message.(63)
Why do file names gets truncated to 8 characters when I save from Prism 3.00 (Windows)?(64)
Why do I get a message about the object being too big for the page?(66)
Why does my computer crash with an error in a module that ends with ".DRV"?(71)
I have some Excel files into Prism. When I try to open the Prism file, I see an "error" message from Excel. (72)
Why does InStat say "access violation" when I attempt an ANOVA?(74)
How can I get rid of the header (file name, date, etc.) on the top of each printed page? (75)
How can I print a graph in landscape, rather than portrait, orientation?(76)
Why does vertical text appear on my graph, but not print?(77)
Why do vertical text and curves from Prism for Macintosh graphs appear grainy when printed from MS Word or other programs? (78)
Prism does not print some pages of my document, and I can't access the "File.. Printer setup" dialog.(80)
How does Prism compute "area under the curve" (AUC)? What are its units?(82)
How can I share Prism files with colleagues who don't own Prism (or own an earlier version)?(83)
How can I place a table on a Prism graph?(84)
How can I place angled text onto a Prism graph? (85)
How can I edit a Prism graph that I've pasted into PowerPoint or Word?(98)
I followed the manual instructions for making a Lineweaver-Burk plot, but the line isn't right. Why?(100)
What are Prism's hardware and system requirements?(102)
How can I make the plotting area on a Prism graph transparent? (103)
When I try to print from the DOS version of InStat or InPlot, I get an incorrect message saying that the printer isn't ready, or the printer just hangs.(104)
Why can't I see the menu that is supposed to appear over my InPlot graph?(105)
Can Prism create horizontal error bars (showing error in the X variable)?(106)
How can I change Prism's ruler from inches to cm, or from cm to inches?(107)
Can I replace my disks and/or manuals? (113)
Can I install my software on more than one computer?(115)
How can I get a price quotation? (117)
Can I buy GraphPad software online? (119)
What's new in Prism 4?(121)
What's new in InStat version 3? (122)
Are network or site licenses available for GraphPad software?(124)
How can I put error bars on a column scatter graph? I want both individual points and error bars.(125)
When I attempt linear regression, why is the results page blank?(126)
Why the odd way of doing Scatchard (or Lineweaver-Burk) plots shown in the Prism manual? Why not use linear regression?(127)
How can I make a Before/After graph?(132)
I'm trying to make a Scatchard plot using linear regression. How do I make the line extend far enough?(133)
I'm trying to make a Lineweaver-Burk plot using linear regression. How do I make the line extend far enough?(134)
How can I make a Bland-Altman plot with GraphPad Prism? How can I add dotted lines showing the limits of agreement?(135)
Temporary files created by GraphPad Prism(136)
Can I put dates or times on the X axis of an X-Y plot?(137)
Writing an equation of a curve or line on the graph(138)
I want to paste symbols from a Prism graph legend to a Word document, but I can't place them where I want.(139)
How can I copy portions of a Prism sheet name to another sheet?(140)
How can I do standard curve calculations with replicate "unknown" measurements?(141)
How can I test for differences among curves fit to three or more data sets?(144)
How do I combine a column scatter plot and a box-and-whiskers plot on the same graph, side-by-side, for the same data?(145)
Calculating and graphing geometric means?(146)
How do I make XY plots showing "dilution factor", instead of concentration, on the X axis?(148)
I entered "dilution factors" into the X column of my data table. Can Prism convert these to concentrations?(149)
Can I use a Prism data table as a spreadsheet, and write a formula into a cell?(150)
How can I create two X-axis lines on an XY plot?(152)
How do I orient my Y axis title horizontally? (153)
How do I remove some, but not all, of the tick labels from my graph?(154)
When I paste or import data from Excel to Prism, nothing is pasted, or incorrect (or truncated) values are pasted.(155)
How can I subtract baseline values from my data automatically in Prism?(157)
How can I convert my data to "percent of control" or "fraction of control"?(162)
How can I divide one column by another in Prism?(163)
What determines how low a Kaplan-Meier survival curve ends up at late time points?(164)
How can I put a zero concentration point on my semi-log plot (e.g., competitive binding curve or dose-response curve)?(165)
Prism and EPS format(166)
I run Prism on a network. How can I determine how often all licenses are in use, so I know whether we need more licenses? How can I tell which users are using a Prism license right now?(167)
I have multiple data sets, and the X values are not identical among all sets. How do I enter data into Prism?(168)
How can I determine an EC90 (or any EC value other than EC50)?(169)
I have two rows of data in several columns. During configuration of two-way ANOVA, why is the Bonferroni post test option greyed out?(173)
How can I run a Prism script when there are spaces in the path name?(175)
Fisher's Least Significant Difference (LSD) test(176)
I have two Y axes, left and right. How can I turn the right-hand axis title, so that it runs up the page rather than down?(178)
How do I determine whether two dose-response curves are parallel?(180)
Why does Prism report "floating point error" or "did not converge" instead of the results of a nonlinear regression?(182)
We don't really have a server. Can I share a network copy of Prism with users networked to my computer?(185)
Must a network version of Prism be constantly running on the server?(186)
What can I do about long, overlapping bar graph labels?(188)
How to get "exact P values" from multiple comparisons tests that follow one-way or two-way ANOVA(189)
Can I put a Prism graph into Word (or PowerPoint), then double-click on the graph to return to Prism for editing?(194)
How do I add a simple connecting line to my XY graph?(195)
I have "open" symbols on an XY graph. How do I make a connecting line show through the symbol?(196)
I'm trying to compare two nonlinear curve fit models using an F test. Why can't I move back and forth between Equations 1 and 2?(197)
How can I put differently colored/shaped symbols together in the same column of a column scatter graph ("dot plot")?(198)
Is it better to plot graphs with SD or SEM error bars? (Answer: Neither)(201)
Why does Prism report the standard errors (SE) of best-fit parameters, while some other programs report standard deviations?(202)
Why is the 95% confidence interval of the X intercept of linear regression asymmerical? Why doesn't linear regression report a standard error of the X intercept, like it does for the Y intercept? (203)
How can I decide on initial values to be used when fitting a user-defined equation?(205)
How can I uninstall InStat?(207)
Graph tip - How do I make a second Y axis and assign particular data sets to it?(210)
Why won't Prism transform my X values? (212)
How to create a PDF file from a Prism graph or layout.(213)
When I attempt a t test with Prism, it gives me an error message: "You must have two or more values in each group". But I do. What's wrong?(214)
Having fitted an nth order polynomial to one data set, how can I now fit that exact curve to a second data set and obtain goodness-of-fit data? (217)
I'm using a logarithmic scale for the Y axis of a bar graph. Prism plots numbers greater than 1 properly, but numbers below 1 as inverted bars. What can I do?(219)
Does Prism do logistic regression or proportional hazards regression?(225)
I'm doing survival analysis on several treatment groups. When I select all the groups for comparison, the results are not significant. But when I select two groups, I sometimes get a significant result, sometimes not, depending on which two I select. Is this correct?(226)
Transferring user-defined equations from one computer to another.(227)
Having completed a Prism project, I want to start a new project but use similar tables, graphs, and analyses. Can I make a template? (228)
How can I compare values measured before and after an experimental treatment when values are normalized such that all initial values are 100%?(229)
McNemar's test (231)
I erased the Y-axis title. How can I put it back?(232)
When I switch from an ordinary (linear) X axis to a log axis, the curves become incomplete or ragged(233)
Do the Mac versions of Prism, InStat and StatMate run under Mac OS X?(236)
I can't get the right fill pattern on my bar graphs in Prism 3. What's wrong? (237)
Testing whether the slope of a linear regression line differs from 1 (or some other value)? (238)
Using Prism 3 Mac, I can't print vertical or diagonal text in some cases. What can I do? (239)
Why does Prism 3 Mac crash when I try to save to a zip drive?(240)
Can InStat or Prism compare observed and expected counts (frequencies) with a chi-square test? (I don't want to analyze a contingency table, I want to enter the observed and expected values for each category.)(241)
Some of my nonlinear curves extend horizontally beyond the data points; others do not. Can I control this?(245)
Comparing slopes of linear regression lines: If there are three or more lines, how can I account for multiple comparisons? How to get confidence interval of difference or ratio of slopes? (248)
How can we set up Prism on a network so that users can save templates to their own, individual directories?(250)
How can I slow down the scrolling on a data table?(251)
After downloading Prism 3 for Mac, why can't I install/run the program?(255)
Can I do nested ANOVA with Prism?(258)
Can I graph data as median values, with error bars showing the range? (259)
How can I make my axis title wider? The word wrapping breaks it into lines that are shorter than I want.(260)
I exported a graph from Prism 3 Mac as a PICT file enlarged to 12X. Why does the graph look so bad when opened in PhotoShop?(265)
I'm using linear regression in Prism to determine pA2 values for a Schild analysis. Can I get the standard error for the X intercept? (269)
Why does Prism Mac display "Type 2 (or Type 11) error"?(270)
Why does Prism (Windows, v3) crash when I try to copy a graph to another program?(271)
Writing special characters, such as "male" and "female", by installing a new font. (273)
Questions about the OLE automation VBA command Prism.Quit(275)
Why does Prism leave some interpolated X values blank? (278)
What is the difference between "Save Family As..", "Save Template..", and "Save Method.."?(279)
How can I compute fractional change or percent change with Prism?(281)
I need hints for installing and running Prism in Windows 2000 or Windows NT. (285)
When fitting a family of curves with nonlinear regression, I want to constrain a parameter to a different constant value for each data set. (286)
When I tried to buy Prism or InStat online, I got an "Unrecognised signature" error. Why? (287)
Prism 3 bug: Paste-linking one cell from Excel 2000 to a Prism table doesn't work.(288)
After upgrading to Prism 3 for Mac, why do I have trouble opening files made in Prism 2?(290)
I can't close the "Instat Guide" window in InStat.(291)
Prism 3a for Mac does not break a curve or connecting line on a graph with a discontinuous X axis. Is there a solution for this?(292)
Graph tip - How can I make a histogram starting with raw data? I want Prism to compute the frequency distribution for me.(296)
Graphing curved Scatchard plots(300)
I have a set of data with 16 replicates, but my printer only prints 13. How can I get all 16 columns side-by-side?(302)
How can I fit a three-phase exponential decay curve to my data?(303)
Can I change the thickness of grid lines on a Prism graph? (304)
How can I shade the area below the curve on an XY graph? (309)
I tried Prism's logit transformation, but got no results. Why?(310)
Where can I see the actual values for standard deviation/standard error that Prism plots as error bars?(311)
I need more help creating dose-response curves with Prism.(313)
Why is my column scatter plot missing some points? Why is there an extra point?(314)
I'm having trouble making the bar graph I want. Can I get more help?(316)
I need more help setting up an RIA or ELISA analysis.(318)
I need help with my survival analysis.(320)
I need more help setting up a t test in Prism. (321)
Troubleshooting pasting a Prism graph into Microsoft Word for Windows (322)
Will you port Prism or InStat to Linux? Does Prism work with the Windows emulator Wine?(326)
Is post-testing after two-way ANOVA effective when the factor interaction is significant?(328)
How can I determine B_max from a homologous competitive binding experiment (where the hot and cold ligands are chemically identical)? (331)
Why don't the results of the Wilcoxon matched-pairs test from Prism or InStat match the results of another program or book?(332)
How can I make a category graph -- a XY plot with a categorical X variable? (333)
How do I handle data with mores replicates than Prism can accept. (336)
Changes in Dunnett's test between Prism versions(337)
Can I open IPG (InPlot graph) or .GP (InPlot data) files in Prism?(338)
Why can't I download InStat 3.05 to a floppy diskette?(340)
How do I transpose columns and rows of a Prism data table?(342)
When doing a nonlinear regression, can I get the covariance matrix?(344)
What can I do when Prism freezes or crashes to a "blue screen"? (346)
When I attempt a sigmoidal curve fit, Prism mistakenly tells me that I should enter the logarithm of each concentration, rather than the concentration itself, in the X column.(348)
When I choose to weight nonlinear regression by 1/SD, why won't Prism give me any results?(349)
Where is the method for nonlinear regression used by Prism published?(351)
When I re-opened my project file, the calculations were gone. What should I do?(355)
How can I do a logrank test with Prism?(358)
How can I control the number of decimal places seen on bar graph labels?(360)
How can I constrain one parameter of a curve fit to a range?(362)
Can I integrate Prism into other programs?(364)
After doing logrank analysis on three or more survival curves, can I perform multiple tests for differences between pairs of curves?(370)
Why doesn't "Change.. Number Format" work on my results sheet?(372)
How can I prevent a "page fault error" when I try to view the gallery in Prism 3 Windows?(374)
Can I access Prism figures using hyperlinks from other documents?(375)
I can't install my software. I get a message saying "only power users may install software" or "access denied," or "you are not authorised to perform this action" or "only Administrators may install prism" or "unable to save serial number file".(377)
When I export a horizontal bar graph as a TIF file, or copy and paste on the clipboard, I lose text on the left axis labels.(378)
Why can't I find the "antilog" format for labeling my axis ticks?(381)
Will Prism open and modify files that I create using the demonstration version? (383)
Why can't I save files using Prism Mac 3a on a network?(386)
Why is it taking so long to do a Spearman correlation using Prism (or InStat)?(387)
What published papers document the superiority of nonlinear regression over Scatchard analyses and similar linearizing techniques?(389)
What types of custom equations can I enter into Prism?(390)
How does Prism function on a network? What are the network system requirements?(392)
I can't use the "Fixed size" radio button to adjust bar widths.(393)
How can I reproduce a Prism graph in PowerPoint so that various objects appear sequentially in a presentation?(395)
I did a curve fit, but Prism didn't put the curve on my graph. (402)
Can I import a graph from another graphics program to Prism?(405)
I emailed a Prism file from my Mac, but the recipient couldn't open it on his PC. (407)
I put a blank row in my data table, formatted for X = text. I wanted to produce a gap at this point in my bar graph. But a garbled stretch of text is inserted in the middle of my graph. What's wrong?(409)
How do I make a Microsoft PowerPoint slide from my Prism graph? (411)
When installing on a network server, is a reboot required?(415)
For a Mann Whitney U test, how does Prism handle ties?(416)
How to test for Normality with Prism(418)
Why are the error bars on my graph the wrong length? (422)
Why is my r² value so low, even though the line comes close to my points?(427)
When I try to export a layout at high resolution for publication, Prism displays a "Not enough memory..." message. (429)
How can I set up nonlinear regression to constrain a parameter so that its best fit value must be greater than 0.(431)
Coping with outliers(433)
Does Prism do median-effect analysis for evaluating drug synergy?(435)
I had trouble installing a Prism update. Can I restore the old version?(437)
Graph tip - How to make some error bars to go up, and some to go down.(438)
Fitting dose-response data that are sigmoidal when X is concentration, rather than log(concentration)(440)
Is Prism for Mac compatible with Excel?(445)
Is it OK to compare data sets with different N values using one-way ANOVA, and post tests?(447)
Using a Prism script, I can get Prism to import my data. But how do I get it to do an analysis?(454)
Do you plan to make a Windows or Mac version of InTend? (456)
How is s_y.x used to interpret regression analysis? (458)
When analyzing a contingency table, the p value indicates a significant difference (P<0.05), but the confidence interval for the Odds Ratio or Relative Risk does not. Why?(468)
Issues transferring PowerPoint files containing Prism graphs between Windows and Macintosh.(470)
How can I make a 3-D graph in Prism?(472)
How do I delete an entire project file?(474)
Understanding the '# of subjects at risk' page of survival analysis(492)
Can I do one-way analysis of variance with two groups?(497)
How do I write a literature citation for an analysis done using GraphPad software, or using a QuickCalc on graphpad.com?(499)
How Prism computes percentiles(501)
When I create a layout, how do I keep each graph the same size as on the graph sheet? (502)
Does Prism calculate standard error of the geometric mean?(504)
Can I export data from a Prism table directly to a relational database program?(506)
When I try to install or run InStat or Prism Mac, I see the message: The application could not be opened because "CarbonLib" could not be found. (508)
How do I get a Hill slope from saturation binding data? (511)
I bought the regular version of Prism (or InStat), but the demo version that I had before runs instead.(514)
How can I make all the graphs on my Prism layout the same size?(517)
Can I configure Prism so that it opens the way it was closed?(520)
Can I create horizontal grid lines -- without the vertical ones?(522)
What is a software update? How is it different from an upgrade? (524)
I need more help with figuring out how to weight my data points.(526)
ANOVA and t tests with data entered as mean, N and SD (or SEM).(530)
How should I compute an "average" EC50 for several experiments? How can I express its uncertainty or standard deviation?(534)
Which curve-fitting model should I use for my sigmoidal fit--the Boltzmann or one of the logistic equations?(537)
How can I find my Prism serial number or license?(538)
The q and t ratios reported with the multiple comparison tests follwing one-way ANOVA.(540)
When trying to open one of the Acrobat pdf manuals, I get the message: "Could not be opened as application that created it could not be found...".(543)
When I paste a graph from Prism to Excel, labels are corrupted. (545)
For both linear and nonlinear regression of replicate values, Prism gives a choice of fitting individual replicates vs. fitting the means. What's the difference? Which should I choose. (549)
When I click "Explain my choices"in InStat, the Help window mentions a "flowchart". But it's missing. (550)
How can I compare the slopes and intercepts of two linear regression lines statistically? (558)
Can all of the features of GraphPad be specified through a scripting language?(569)
Can I make graphs on which symbol sizes correspond to the sample size (N)?(572)
With Prism Mac, how can I write graph titles, labels, etc. in a language other than English?(581)
Do you have a plan making StateMate for Macintosh? Are there plans for creating a version 2 of StatMate for WIndows? (582)
I plotted some data on a log/log graph, and I want to fit a straight line to it. Why does Prism say that the regression will not be on the log values?(584)
(Prism 3) How can I export bitmap or web graphics from a script?(586)
Statistics with n=2(591)
How can I write a script to import just part of a file?(592)
Can Prism export JPEG files? (597)
When I request a runs test as part of linear or nonlinear regression, Prism did not provide the P value. (598)
I am having trouble downloading software I purchased online. (600)
Can any GraphPad software do analysis of covariance (ANCOVA)?(607)
When importing data into Prism, can I rearrange it at the same time?(617)
Will Prism do a three-parameter or four-parameter logistic fit to my data?(618)
Why does Prism 3, by default, store printer settings properties in my project file? What will I lose if I change this option? (621)
My InTend database seems to be corrupted (' a file error has occurred'). How can I fix it? (623)
Can Prism or InStat aquire data from a database using ODBC?(625)
Copy and pasting legends: When it works, when it doesn't. (628)
After exporting a graph or layout as a TIF file, how can I view that file to see that it is OK.(634)
How do I determine whether a point is significantly different from a predicted value based on a linear regression? (639)
Why does InStat give me the message "This copy of InStat is for a single user, and is already in use"? (642)
AfterI opening a Prism file, all analyses and curve fits are recalculated, which can be slow.(643)
How do I change the width of a column on a Prism data table?(647)
I modified Prism's two-phase exponential decay equation to add a third phase. How can I display the half-times on the results sheet?(650)
Someone e-mailed me a Prism 3 file done on a Mac. I have a PC, and I can't open the file with Prism 3.(651)
Are there foreign-language versions of any GraphPad software?(652)
How can I write an IF function in Prism to yield a blank (missing value) when Y is less than 0?(653)
I can launch Prism, but not start a new project or open an existing Prism file. I get a message citing a fault in module "windows\system\GDI.EXE".(659)
I get a Mac error message #41 when I try to print from Instat. (662)
InStat Mac crashes when I print or quit.(663)
I can't import my comma-delimited text files.(664)
When we use a network version, all works well at first. But gradually, the available number of licenses seems to dwindle and then Prism gives messages that all licenses are in use.(665)
Bugs in Dunn's multiple comparisons test following the Kruskal-Wallis test.(667)
Is my version of Prism fully compatible with MS Office XP (Word, Excel, PowerPoint)? (668)
What is the literature reference for the Katz method (for computing confidence interval for relative risk)?(670)
I want to paste-link a Prism 3 graph into Microsoft Excel, but it doesn't work.(672)
I can't get standard curve calculations after log-transforming my X values. The unpaired Y values are dropped on the results table.(673)
Can Prism open Instat files?(674)
How can I get the lower and upper confidence limits of a best-fit parameter into Excel as separate values, rather than a single text string?(675)
I have three data points. Why does Prism tell me I have too few points to fit a second-order polynomial curve?(676)
How to test for a significant difference between the slopes of two linear regression lines when the intercepts are fixed? (677)
If I paste a Prism Windows graph into a Microsoft Word document, it looks fine on the screen. Why is the Y-axis label missing when I print?(679)
How can I increase the precision of the best-fit values reported by Prism?(681)
For Instat Mac installed on a network, how do I get the Help files to work for all users?(682)
How can I get exact P values below 0.0001 for t tests or ANOVA?(687)
After nonlinear regression, can I see the best-fit line as a table of X, Y coordinates?(688)
How does Prism compare with SigmaPlot? (689)
Can I install the network version of Prism Mac on a Windows computer? The network version of Prism Windows on a Mac?(691)
Can I make Prism mark certain bars or symbols with asterisks (to indicate statistical significance)?(693)
Will Prism import data in SYLK format?(694)
How can I change the orientation of a page in the Notes section of Prism?(696)
Is there a way to rearrange the order in which graphs and data tables appear in the Prism Navigator tree? (697)
I'm fitting my data to a variable slope sigmoidal curve. Why can't I use the option to compute Ki from IC50?(698)
My text box in Prism is set to be full-justified, but prints as left-justified.(699)
Using Prism 3 for Windows, nothing happens when I select the File... Export command. No dialog comes up. (702)
Old fixed bug: Two-way repeated measures ANOVA with matching by columns(703)
Can Prism use Type 1 or Opentype fonts (that come from Adobe)?(704)
Can Prism find the lethal dose 50% (LD50) using logistic regression (or probit analysis)?(705)
The 90% confidence interval for Dunnett's and Newman-Keuls test are no different than the 95 percent confidence interval.(707)
I made some column bar graphs and all was fine. Then, suddenly, the bars vanished from my graph. The axes were still there, but no bars. The data tables are fine, the Y axes had sensible limits, but no bars. What happened?(708)
How can I launch Prism from an intranet web page (instead of from an icon in the Start menu or desktop)?(709)
How can I change printing size in Prism?(710)
How can R² be negative?(711)
Running Prism for OS X, nothing appears on the toolbars. I see only three blank rows. (712)
When I update to Prism 3cx for OSX, I get an error message that my serial number is for Prism Windows (but it isn't).(713)
I can't see the curves or connecting lines in my Prism graph, but they appear after exporting the graph to another program.(717)
The confidence interval for the ratio of median survival times(718)
When I try to run StatMate under windows 2000, I get the following message:" You have not installed statmate properly on this machine". (720)
I tried to download .hqx and .bin files to my Mac, but my web browser does not automatically decode .bin and .hqx files.(721)
We have a network license for Prism (or InStat or StatMate). The problem is that the shortcut icons, that launch Prism from individual computers, vanish when someone else logs on that computer. How can I make sure the icons are always shown?(722)
Graph tip - Can Prism plot two X axes or three Y-axes?(723)
Y-axis title of graphs (created with Prism 3cx under Mac OSX 10.2, "jaguar") pasted into Word or PowerPoint print badly, with lots of extra stripes converging at a point.(725)
How can I include commas in Prism's axis numbering (i.e. "100,000")? (727)
Is there any way to change the size of arrow heads?(728)
When entering survival data, what should I do with animals or patients that die the first day?(729)
How can I plot a one-sided confidence (or prediction) band around a linear regression line or a nonlinear regression curve?(730)
Graph tip - Creating a quality-control Levy-Jenning's graph with Prism.(732)
Problems using Prism Mac 3cx with OSX.(736)
Do I need permission to link to the graphpad.com web site? Will you add a link to my site?(737)
I'm using Prism 3. When I paste a graph into Powerpoint or Word, some text labels are cut off.(740)
After downloading an installer for Prism 3 using Mac OS X, I double-click on the .bin file and nothing happens. The installer doesn't launch. (741)
I am trying to install a demo of StatMate, InStat or Prism, but I get a notice that the program has expired.(752)
Graph tip - Formatting the right and left Y axes differently. (753)
My vertical Y-axis title includes a Greek letter, but it is horizontal in layouts or when copied and pasted into Word. (754)
Can any GraphPad programs digitize data from paper graphs or images of graphs?(759)
Can Prism expose its functions for other programs to use? For example, COM objects or DLLs. I really want to search a tool that can provide the curve fitting functions, so that I can use them in my program, and also let users pass different parameters and get the returned values.(760)
Can Prism (or InStat) perform Fisher's exact test with tables that are larger than 2 by 2?(762)
In Prism's built-in variable slope dose-response curve, why is the HillSlope exponent applied to not only the X values (log concentration) but also the logEC50? (763)
When I print a graph from Prism Mac, open symbols are printed filled and the Y legend is missing. (764)
Prism 3 Mac with multiple users(765)
I use Prism 3 Mac under OSX, but the help system launches classic mode or doesn't launch at all.

(771)
Why can't I export my graph in gif format for inclusion on a web site.

(773)
I am having trouble printing from Prism Windows to the NuGenesis printing system (that lets you "print" to a database).(774)
My Prism Mac graphs look awful when pasted into Apple Keynote.(775)
After installing InStat Windows, it works fine for me. But when others log on to the same computer, there are no icons to launch InStat. (777)
I'm trying to install Prism 3cx (or the updater) on a Mac with OSX. The installer stops, saying that it requires 4096K of physical memory, but my computer has several GB of memory. (778)
Problems with the Gaussian distribution equation built in to Prism.(779)
I want to use a robust nonlinear regression technique.(780)
When I try to launch Prism Mac (3 or 4), I get an error message that the Times New Roman Font is not installed. (781)
One-way ANOVA computes a P value <0.05 (significant effect of treatment), but a Tukey multiple comparisons test finds no statistically significant differences between any pairs of means. Is this a contradiction?(782)
Problem finding interpolated values with Prism 3.(783)
How can I get my data from GraphPad InTend into a database program?(784)
Prism 3 (Windows) crashes when I try to print.(787)
Where can I find the Prism viewer?(788)
Troubleshooting problems with exporting TIFF images from Prism(790)
I'd like to hire someone to write a Prism script and/or to help me integrate Excel and Prism. (792)
Can Prism 3 open my Prism 4 files? Can Prism 4 open my Prism 3 files? (793)
How do I install Prism, InStat, or StatMate on a network? (Windows platform)(794)
How do I install Prism, InStat, or StaMate on a network? (Mac platform)(795)
I pasted a range of cells from a results sheet to a graph in Prism. Now I can't reformat the pasted table to change the range. What's wrong?(796)
When I create area fills, they don't print correctly, or they don't show when I copy a graph to PowerPoint.
(797)
Prism says my user-defined equation is "too complex".(798)
Graph tip - How to create a box-and-whiskers graph by entering the minimum, maximum, median and 25th and 75th percentiles rather than entering the raw data?(802)
Problems using the Insert Wingding command on Prism Mac(803)
I want to create a Column Graph with different positive and negative standard error bars (calculated elsewhere). (804)
The File.. Send mail command is not available (Prism Windows). Using Prism 4 all three menu choices under File..Send mail are gray; using Prism 3 the menu choice File..Send mail is gray. (805)
Greek letters and math symbols don't work on vertical text such as Y axis titles.(808)
Graph tip - How can I plot an odds ratio plot, also known as a Forest plot, or a meta-analysis plot?(809)
I have a network license for Prism Mac. Can this be shared by some users who use OS9 and others who use OS X?(810)
I wanted to export just the legend into another program, but Prism always includes the entire graph when it copies to the clipboard or exports to a tiff or jpg file.(811)
Bugs in computing the 95%CI of the X intercept.(812)
When I put a graph on a layout in Prism 4, its background color shows as a border around the graph.(813)
When I try to paste-link data from Excel, the command is not available (gray).(814)
Why does Prism (version 4 for Windows) sometimes crash when I try to open a file, create a new file, or save a file? (815)
What is the GraphPad License Agreement? (816)
I choose to graph confidence or prediction bands with nonlinear or linear regression, but they don't appear on the graph.(818)
I've just upgraded to Prism 4. Should I keep Prism 2 and 3 on my computer? (819)
Why doesn't Prism report R² for linear regression when I force the line through the origin (or some other point)?(820)
Using Prism 4 Mac under OSX, when I try to dupicate a graph with its data sheet (duplicate with family ), Prism shows an error message "this file is in use or read-only". (821)
Prism 4.00 crashes when I try to print all page layouts. (822)
When I export from a page layout, the tif file looks wierd (lacking symbols). (823)
Can I write a script that changes the graph title or an axis title? (825)
In Prism 4, when I make a new data table (plus graph), I uncheck the option to create a new linked Info sheet. But Prism creates a new Info sheet anyway.(826)
I'm trying to install InStat 3a on a Mac with OSX. The installer stops, saying that it requires 4096K of physical memory, but my computer has several GB of memory. (827)
Can Prism transform my data to log base 2 or some other base?(828)
When I try to click on an axis or object in Prism 4, some other (seemingly random) object gets selected. (830)
I uninstalled Prism Version 3.03 and I am still getting a listing for Graphpad Prism 3.03 in the "Add/Remove.." window of the Control Panel. . (840)
I need help computing a pA2 using global fitting.(843)
What is the largest data table you can create with Prism and InStat?(845)
How do I enter values in scientific notation in the form of 1x10-10, 1x10-9?(847)
After exporting the layouts in JPEG format, only the curve appeared in the figure. No symbols and error bars with the figure are found in it. (848)
I entered my data with several replicates for each X value. Can I perform the runs test following linear or nonlinear regression?(850)
If I purchase an upgrade of a GraphPad program, does the installer require the presence of the older version?(854)
Is GraphPad Prism compliant with section 508 so it can be used by people with disabilities?(855)
I included an <info> section in my data file, but when I import the data, the other information does not get imported into the linked Info page. (863)
When exporting a layout (PICT, TIF or JPEG) from Prism Mac 4.0a, the legends are shifted with respect to the graphs. (865)
When I print a bar graph from Prism 4.00, the left-hand border of all bars is missing. (867)
When I copy data from Excel into Prism for analysis,then try to copy the Prism results back into the same Excel spreadsheet, what was previously copied from Excel is pasted to the spreadsheet, not the Prism results.(870)
Has Prism been validated? Does it comply with the FDA regulation 21 CFR Part 11?(872)
I exported a graph from Prism (ver 4 for Mac OSX) as a "TIF bit map" to a Word document. When I tried to print the document, the image was blank. What's wrong? (874)
How can I delete a color scheme or transfer a color scheme between computers?(877)
I want my curves (fit by nonlinear regression) to be behind the data points, rather than in front of them.(879)
Running Prism 4 for Windows, only some (or none) of the tool bars appear. (883)
When I export a layout from Prism 4 (Win or Mac), the exported file doesn't include the data points.(884)
When my legend includes a Greek letter, the preceding bar (or symbol) is larger, so doesn't match others on the page.(885)
The symbol or bar that precedes a legends is larger when the text contains a Greek character have (preceding the text) than it is when the labels contain no Greek characters. (886)
Prism 4 Windows says it "cannot save" my project.(889)
Before buying the network version of Prism or InStat, I want to test GraphPad's metering scheme on my network.(890)
Using Prism Mac, I can't open the files by double-clicking on them. (891)
I'd like my column scatter graph to have symbols moved up or down a bit so points with approximately the same Y level are plotted in a straight horizontal line? (894)
Prism tip -- How can I insert a dagger or some other special character onto my graph?(900)
Fitting the ratio of two EC50 values. (901)
I am having trouble fitting the operational model described in Chapter 42 of Fitting Models to Biological Data using Linear and Nonlinear Regression. (902)
Creating bar graphs with 3 grouping variables using GraphPad Prism.(904)
How can I add symbols and lines to a bar graph? (905)
When I try to launch a networked Prism Mac (version 4), I get error code -54.(906)
When I make a category graph in Prism4, I want to change the gap after the last category. Also I don't want to label every category.

(908)
I want to start with a simple file with one data table linked to analyses and graphs. Then I want to write a script that duplicates this family, importing new data each time.

(909)
When I copy a graph created with Prism 4 Mac (OS 8-9) to the clipboard (or export as a PICT file) and then paste (or import) into another program, angled text (and vertical text) appears twice (angled/vertical and horizontal). (910)
The demo version of Prism 4 Mac worked fine for me, and I bought the full version. Now when I open my files, I can't print.(911)
Fitting the crossing point of two intersecting linear regression lines .(912)
How can Prism be integrated with other programs? How can I create a program that saves Prism files?(913)
How does Prism compute the standard errors (and confidence intervals) of the best-fit parameters in nonlinear regression? And how does it calculate the confidence interval of the ratio or difference of two parameters?(915)
The P value reported along with the F ratio testing whether the variance of two groups is identical (part of the unpaired t test results from Prism and InStat) doesn't match another program or book.(917)
R² of unpaired and paired t test results.(918)
Bug: Kolmogorov-Smirnov normality test, fixed in GraphPad Prism 4.01 and 4.0b and InStat 3.06 and 3.0b(919)
How can I determine the Kcat of an enzyme?(921)
Does Prism (or InStat) support network license managers such as KeyServer or FLEXlm?(922)
I would also like to create a figure legend in Word, so need a font that has symbols similar to those used in making graphs.(923)
Prism Windows (version 3 -5) won't start, complaining that it can't find VIC32.DLL.(924)
Some nonlinear regression programs report the chi-square of a fit. What does this mean? Why doesn't Prism report the chi-square value?(926)
Can Prism perform weighted linear regression?(927)
Drawings or chemical structures pasted into Prism Mac from another program have a low resolution. (928)
How many digits of precision does Prism store? How accurate are the results? What are the largest and smallest numbers Prism can store?(929)
Can Prism export a graph or layout in enhanced metafile (EMF) format? (930)
Nonlinear regression: Dependency and ambiguous fits(931)
I have files created by InStat Mac version 2, but InStat 3 will not open them.(932)
How does Prism create the LOWESS smoothed curves?(933)
How can I plot both a confidence band AND a prediction band with my linear regression line or nonlinear regression curve?(934)
When I use Prism 4.00 or 4.0a to fit data entered as mean, SEM (or SD) and N, the standard errors of the parameters seem too low, and the confidence intervals too narrow.(936)
Problems importing data from Excel into Prism.(938)
Does Prism Mac run under Mac OS X 10.3 (Panther) and 10.4 (Tiger) and 10.5 (Leopard)?(939)
When I try to launch Prism 3 using OLE automation, Windows tries to launch Prism 4 (which I no longer use). (940)
Open symbols are larger than closed symbols even though I chose the same size.(943)
New script commands added since the release of Prism 4.00 and 4.0a. (944)
How many technical support personnel does it take to change a light bulb?(945)
The results of Prism's binomdist function does not match Excel's. (948)
Prism's chidist function doesn't match Excel's.(949)
I need to reinstall InTend, but can't find the disk or it doesn't work. (950)
I want to put the actual data on a bar graph.(951)
Trying to run Prism 4 or Prism 5 for Mac, it crashes on startup with a type 3 error(953)
Prism's reports a different resuts for the Shapiro-Wilk normality than another program. (954)
When to choose WMF, EMF or EMF+ format(955)
Location of Prism templates, methods and example files (956)
Q&A: Normality tests(959)
Choose colors in Prism Windows(960)
Troubleshooting: What to do when Prism won't start (Windows).(961)
Once I've pasted my Prism graph into PowerPoint or Keynote, can I ungroup it to edit it?(963)
What kind of compression does Prism use when exporting compressed tiff files?(964)
I wish to compare three or more models using AICc. How do I compute their relative probabilities of being correct?(965)
Generating random numbers with Excel(966)
How can I compute the 95% confidence interval of the ratio of two values (knowing their SD, and assuming they follow a Gaussian distribution)?(970)
My graph looks fine on screen, but when I print or export a layout, I see a little blip at the bottom of symbols where the error bar is shorter than the symbol.(971)
I prepared graphs with full frame. When printing on a a HP Laserjet 1200, it will not print the upper segment of the frame in spite of the fact that I see it on the screen (it prints only the left, lower and right segments of the frame).(972)
The area-under-the curve analysis reports Total area and Total peak area and (sometimes) Net Peak Area. What's the difference?(973)
When I force a linear regression line to go through the origin, the 95% prediction bands seem wrong.(974)
I need help fitting a family of association kinetic curves. (975)
When I try to launch Prism Mac 5 from a server, I see one of these messages:

"The application program "Prism" could not be opened, because it is in use."
"The operation could not be completed. An unexpected error occurred (error code -54)."

(976)
How can I make a script run faster?(977)
What is the meaning of * or ** or *** in reports of statistical significance from Prism or InStat?(978)
With GraphPad Prism, is there a way to force the slope to equal 1.0 in a linear regression? (979)
Does GraphPad Prism or GraphPad InStat offer Duncan's multiple comparison test?(980)
Can Prism create SparkLines? (981)
How can a script tell Prism to quit?(982)
Can Prism make pie charts?(983)
InStat and Prism give a different P value for Fisher's exact test than does another program.(985)
I used Prism's correlation analysis. How do I plot the corresponding line.(989)
When I make a grouped bar graph with Prism 4, it puts labels under the X axis for each individual bar. I want to label groups of bars. (990)
How can I figure out if two drugs are additive or synergistic?(991)
When I print results tables from StatMate 2, parts of the table are cut off.(992)
How can I write a script to print all pages from a section.(995)
How can I write a script to print all data tables (or graphs) in a project?(1000)
When I copy and paste a Prism graph into PowerPoint 2000, the PowerPoint slide doesn't update to show the changes. Also, my bar fills don't look or print right and curves look ragged when printed. (1002)
Can Prism save to a web folder?(1004)
What to do when data fail tests for homogeneity of variance (part of one-way ANOVA)?(1007)
What are the arguments for the ibeta() function?(1008)
Can Prism test for a significant difference between two distributions using, for example, the Kolmogorov-Smirnov test? (1009)
After pasting a Prism layout into PageMaker 7, I am unable to create a pdf file. (1010)
Asymmetrical (five-parameter) logistic dose-response curves(1012)
How can I perform linear regression, fixing the slope to equal 1.0 (or some other value)? (1013)
How can I be notified when GraphPad posts new versions of its software or new articles in the library?(1015)
How can I test for differences in standard deviation between two populations. (1017)
StatMate 2 is missing some features of StatMate 1.(1018)
Fixed bugs in the Mann-Whitney test and Wilcoxon matched pairs test in GraphPad Prism versions 3-5.(1019)
Prism Mac crashes when I try to send it a graph from StatMate. (1025)
The standard errors of some paramters in global curve fitting seem too low (confidence intervals too narrow). (1027)
Interpreting 'not significant' P values using the counternull value.(1031)
In the first two screens of StatMate 2 Windows, a couple of lines of fonts are unreadable. (1033)
When exporting a layout composed of 2 or more bar graphs, all but the first graph show the wrong fill pattern.(1034)
When I export a layout from Prism 4 (windows), the bar fills of some of the graphs aren't right.(1035)
How to fit different portions of the data to different equations?(1036)
How can I determine needed sample size for an experiment to be analyzed by two-way ANOVA?(1038)
I made a bar graph with Prism 4. When I changed the shape of the graph, all the bars vanished. (1040)
Some of the hyperlinks in the help section of StatMate 2 for Macintosh don't work. (1046)
Some of the links in the Mac version (OS 10.3) of InStat 3's Help Menu don't work. (1047)
When I copy and paste bar graphs from Prism 4.01 or later to Word 2000 and then create PDF files from the Word documents, the pattern fills on my bar graphs become solid.(1048)
When I make bar charts, is there a way to have the X-axis hidden so that the bars look like they are floating? (1049)
Why doesn't GraphPad offer technical support via phone?(1051)
Ive created a log file to see why Prism won't open. The log file reports an "error 1009"(1052)
Issues with pasting or importing Prism graphs into Canvas.(1054)
How large should I expect R squared to be? (1060)
How can I compute a one-sided confidence interval?(1061)
Isn't it 'cheating' to enter a low concentration, rather than zero, for dose-response curves? (1063)
Do any GraphPad programs peform multivariate statistical tests?(1065)
Tips to get a Prism graph into Adobe Illustrator.(1066)
When using the Insert Object command to put Prism graphs into other Windows programs, I can't insert more than 16 objects. (1067)
In nonlinear regression, how can I constrain the sum of two parameters to be less than (or greater than) some value?(1069)
Using nonlinear regression to compare slopes and intercepts of linear regression lines.(1071)
When I try to make a graph from StatMate, I get a message "Cannot create graph. Graphing Requires Prism 4...".(1073)
As part of the t test results, Prism and InStat do an F test to determine whether the variances of the two groups differ significantly. What should I do if this test gives a small P value?(1074)
I downloaded InStat Mac (or Prism Mac or StatMate Mac), but when I double click on the installer, classic (OS9) mode is launched. I want to run InStat for OSX without classic mode. (1078)
How do the three methods compare to survival curves (log-rank, Mantel-Haenszel, Gehan-Breslow-Wilcoxon) differ?(1079)
What is difference between Type I, Type II, and Type III errors? And what is a Type 0 error? (1080)
If one-way ANOVA overall has P>0.05, is it possible for all the multiple comparisons tests to be "not significant"? What about the opposite? If the overall P is less than 0.05, must at least one multiple comparison test be "significant"?(1081)
Do multiple-comparison tests following one-way ANOVA always have less power than a t test?(1083)
Does it make sense to use ANOVA multiple comparison tests to compare two dose-response curves at every dose (or two time course curves at every time point)?(1084)
I know two variables, each with a mean and standard error. How can I compute the 95% confidence interval of their quotient?(1085)
What is the coefficient of variation?(1088)
What is the difference between ordinal, interval and ratio variables? Why should I care?(1089)
Difference between "planned comparisons", "post-hoc tests", "multiple comparison tests" , "post tests", and "orthogonal comparisons".(1091)
Planned comparisons after one-way ANOVA(1092)
Why we recommend you do not use the Newman-Keuls multiple comparison test(1093)
When I add curves to my Prism graph, why don't they match the color of the associated data points?(1097)
When writing a Prism script for the Mac, how do I separate disk names, folder names, and file names?(1098)
How does Prism compute confidence and prediction bands for nonlinear regression or linear regression?(1099)
FItting a dose-response curve, Prism's results seem wrong.(1100)
Segmental linear regression(1101)
Can I write a user-defined Prism transform that applies different transforms to different data sets? (1102)
What functions can I use when constructing user-defined equations or transforms?(1105)
Fixed bug:Multiple comparisons after two-way repeated measures ANOVA with three or more columns (fixed in 4.03/4.0c)(1106)
When does it make sense to use repeated measures two-way ANOVA?(1107)
My Prism graphs use lots of colors. How can I place them into Word in black and white? (1108)
Which test should I use to determine the statistical significance of a 2x2 contingency table? Chi-square? Fisher's exact test? Something else?(1114)
What are the most important fixes and improvements in Prism 4.03 (Windows) and 4.0c (Mac)? (1115)
After pasting a Prism graph (or layout) into Microsoft Word, it seems stuck. How can I move it around the document?(1117)
Minor fixes and changes in Prism 4.03 (Windows)/4.0c (Mac)(1120)
The relative risk computed by InStat is incorrect.(1121)
When I copy and paste Prism graphs into Word, entire Prism objects are pasted. These include raw data and analysis choices I don't want others to see. How can I change the Word file so it contains only the graph without the linked data or analysis choices? (1122)
I cannot install the Prism Mac (or InStat) Demo version because the installation program requests the classic environment OS 9 even though I am running OS X.(1125)
How can I quantify agreement between two tests or observers using kappa?(1126)
The degree symbol appears fine at first, but then changes to a question mark. (1127)
I've installed a Macintosh network version Prism or InStat, but I'm having problems using the program on the server itself. (1128)
Prism Mac 4.0b crashes when I try to export a layout. (1130)
Prism 3 crashes when I try to import data using the unstack option.(1133)
Using Prism Mac 3.0cx and Mac OSX 10.3, the tool tips for sheet names in the navigator sometimes persist, blocking the view of the other sheets.(1135)
I need to make a bar graph showing a minimum, a maximum, and a calculated mean. Sort of like a high/low/close stock chart.(1136)
Graph tip - Changing the width and spacing of columns in Column and Grouped graphs(1137)
What is the difference between correlation and linear regression?(1143)
Has the nonlinear regression in GraphPad Prism been tested against the NIST set of standard data sets?(1149)
I made a graph with two or three axis segments, but Prism keeps changing the size of the graph. It won't stay the size I want.(1150)
The residuals table for nonlinear regression only has X values for the first data set, so Prism cannot plot the residuals from the other data sets.(1152)
Calculating a Z-factor to assess the quality of a screening assay.(1153)
How is the Dunn's post test calculated following the Kruskal-Wallis test (nonparametric comparison of three or more groups).(1156)
Does Prism Mac support the OSX features, Spotlight Quicklook and Automator?(1158)
My Prism file has many data objects linked to Excel. How can I unlink them all? (1159)
Unlinking data objects linked to Excel or text files. (1160)
I want to fit the EC50, and its standard error, not the logEC50.(1162)
I'm running the demo version of InStat, but I can't save or print my file?(1163)
Troubleshooting copying and pasting graphs from Prism into PowerPoint(1164)
When I copy and paste a graph from Prism to PowerPoint, the pasted graph is fine at first, but then it changes with repeated viewing.(1167)
When I copy and paste a graph from Prism 4 (Macintosh) to PowerPoint, vertical and angled text doesn’t look right. (1168)
If I have graphs with different numbers of bars, how can I make the bars on all graphs the same size? (1169)
Troubleshooting OLE (Object linking and embedding)(1171)
I tried to install Prism Mac 4.0c (or the demo or updater). It almost finishes the installation, then stops saying "access denied".(1173)
What is a 'quantile'?(1175)
Graph tip - How do I format my data to make a box-and-whiskers graph?(1176)
[obsolete] Dunnett's post test never reports "P<0.001"(1178)
When I try to select all of the data in my InStat data table, I get the error message "List index out of bounds," and the program crashes. (1179)
I am running a network version of Prism 5, and can't view the help file. It comes on screen, but the table-of-contents links don't actually work and I see the message "Action cancelled".(1180)
I have both a PC and a Mac. Which version of GraphPad Prism would I be happier with, and why?(1181)
Why won't Prism or InStat compute Bartlett's test for equal homogeneity when N=4? (1182)
Searching for Prism files using Microsoft Search(1183)
When I compute the Spearman (nonparametric) correlation with Prism, I get the correlation coefficient but no confidence interval.(1184)
I'm having trouble creating custom colors in Prism Windows (1185)
Details of calculations for ROC curves. (1191)
Can the Prism installer (and uninstaller) work silently?(1192)
I use the Remove Baseline analysis to divide all my columns by a control column. But I want to still show the control values on the graph as 1.0 or 100%.(1193)
Fitting noncompetitive, uncompetitive and mixed enzyme inhibition models.(1194)
When creating a ROC curve, how do I tell Prism whether an increased or decreased test level is abnormal?(1195)
Advice: Don't rely solely on normality tests to decide when to perform nonparametric tests.(1199)
All the sheets in the navigator use the same font. Linked sheets are not bold. (1200)
On our network, the registry is locked so programs running on individual work stations cannot change the registry. Will the networked versions of InStat and Prism run ok?(1202)
Using Prism Mac, I can't select the Arial font. I keep getting Arial Narrow.(1203)
GraphPad programs and OS X 10.6 (Snow Leopard)(1206)
Data I copy from Excel 2004 won't paste into Prism Mac.(1208)
Where does Prism store its preferences file? How can I delete it or move it?(1209)
How can I fit a cumulative Gaussian distribution? How about a two-component cumulative Gaussian.(1212)
Creating a graph with only a right Y axis, and no left Y axis. (1213)
When I print a PowerPoint presentation with a Prism graph, the graph background prints black.(1219)
I've download the Mac demo version of Prism on my Mac running OSX, but my computer can't find an application to open it.(1220)
I checked the option for Prism to compute the geometric mean as part of column statistics. But that value is blank in the results sheet. (1221)
I create axes with the numbers in scientific notation. But it prints with "?" instead of "x".(1223)
Hazard ratio from survival analysis.(1226)
How to use GraphPad programs under Windows Vista or Windows 7(1227)
Can Prism fit growth equations?(1229)
When I try to run a network license of Prism, InStat, or StatMate I get an error message saying "This publisher cannot be verified. Are you sure you want to run this software?(1231)
The Prism 4 script command "Paste 0 1" pastes into the first data row rather than the column titles.(1232)
When I copy and paste a Prism graph into PowerPoint 2007 or PowerPoint 2010, it pastes as a picture instead of an object.(1233)
The distinction between eliminating and identifying outliers(1234)
My company or institution has an annual Prism site license. How do I set up Prism 5 for Windows to run as a server version?(1235)
I'm trying to run Prism 5.00 (Windows) under my company or institution's site license, and I get a message saying the "Licenses folder is write protected."(1236)
When I try to install Prism 5.0 Windows, I get a message: "Please enter the disc labelled #1..."(1237)
How is Prism 5 different than Prism 4?(1238)
Nonsense results when constraining a parameter to be greater than a negative value.(1241)
What's new in Prism 5.01?(1242)
Trouble installing Prism 5.00 under Windows 7 and Vista (Japanese and Korean versions).(1243)
I am having trouble downloading Prism or the Prism demo.(1245)
How does GraphPad Prism compare with Microsoft Excel?(1246)
How does Prism compute the normalized covariance matrix? How does it relate to the actual covariance matrix?(1248)
Can't install Prism 5 with message about not enough free space.   (1249)
I need short term statistical tutoring or consulting.(1250)
How to get legends to be in front of a filled rectangle.(1251)
Tips to make Prism files much smaller!(1252)
Can Prism compute the mean (rather than median) survival time?(1253)
I'm using Prism 5.01 for Windows. The borders on embedded tables on my graphs don't show when I export them or paste them into PowerPoint or Word.(1254)
Prism Visual Basic (VBA) commands.(1255)
My system hangs when I try to update GraphPad Prism (Windows) from 5.00 to 5.01.(1256)
Why nonlinear regression results in Prism 5 can differ from Prism 4. (1257)
How does Prism do linear and nonlinear regression with data entered as mean, SD and N (or mean, SEM and N)?(1258)
Tips for offset axes:(1259)
How to to fit one line (or curve) to two data sets (or more)(1260)
When Prism computes a correlation matrix, are the correlation coefficients simple or partial?(1261)
Graphs look wrong when file created by Prism 4 is opened by Prism 5.(1262)
Problems importing EPS files exported from Prism by another program.(1263)
When I export an EPS file from Prism 5 Windows, an entire page gets exported (not just my graph or layout) so there are huge margins.(1264)
How does Prism compute post tests following repeated measures two-way ANOVA?(1265)
When I double click on a Prism script file (.PZC) notepad opens. I want Prism to run that script.(1266)
Prism won't launch under XP or Vista. It says "Prism requires Windows 98 (or later)". or "Prism cannot start because the DCOM service (an essential part of WIndows) is not running." or Prism 7 won't launch and presents a message about requiring DCOM. (1267)
How do I update Prism on a network?(1268)
The frequency distribution created by Prism does not match that created by Excel.(1269)
When I exclude an entire row in InStat Mac, then save and reopen the file, InStat thinks the wrong row is excluded.(1270)
What does 'impossible data' mean in the results of survival analysis.(1271)
In a box and whiskers plot, what values do the box boundaries, line, and whiskers represent?(1272)
How to create a MSI installation file to install a GraphPad Prism 5 site license.(1273)
When I fit an exponential model, Prism reports the rate constant (k) with both standard error and confidence interval, but reports the half life with only a confidence interval.(1274)
Differences between the Windows and Mac versions of Prism 5 and 6(1275)
My computer uses commas as the decimal separator. When I paste numbers into InStat, it thinks the commas separate columns so pastes the decimal part into a separate column.(1276)
When I look at the color wheel in Prism 5 Mac, it is entirely black, so I can't choose any colors.   (1277)
How can I change the default page orientation for new graphs and layouts?(1278)
Plotting t, z, F, or chi-square distributions with Prism.(1279)
My X axis is time. How can I create a horizontal stripe or bar that marks certain time range (when a treatment was applied)?(1280)
Can Prism fit models defined by a differential equation.(1281)
What is the difference between RGB and CMYK color models?(1282)
Manuals and step-by-step examples for Prism 3.(1283)
Can Prism make a population pyramid graph?(1287)
EC50 values are blank.(1288)
Comparing the fits of two models, when one is ambiguous. New choice in Prism 5.0b and 5.02.(1289)
When I copy a graph (or layout) from Prism 5, and paste into another program, what is its resolution?(1290)
Why can't GraphPad implement OLE on the Mac? (1291)
Copying and pasting graphs from Prism 5 or 6 Mac to PowerPoint, Word, Pages or Keynote.(1292)
I want to create a graph with one Y axis, but have it placed on the right side of the graph.(1293)
Fixed bug: Prism Mac 5.0a crashes when large images are imported using OSX 10.4.(1294)
How do I change the background color of a graph I've pasted into PowerPoint?(1295)
The advantages of centered polynomial regression(1297)
What is the Median Absolute Deviation (MAD) ?(1299)
Calculating the confidence interval for median survival.     (1300)
I downloaded the installer for Prism Mac, but when I double click I get a message: 'no mountable file systems'.(1305)
How should I fit binding data where I use a fixed concentration of labeled ligand but vary the receptor concentration?(1306)
Why are PZF files created by Prism 5 so much larger than PZF files created by Prism 4?(1307)
I can't control the X-axis numbering interval in grouped category graph.(1308)
Pasting a graphic from Illustrator into Prism (windows).(1309)
Pictures don't show when I open a Prism file (saved by Prism 5 Mac) using Prism 5 Windows.(1310)
Using Excel to compute the binomial distribution.(1311)
I can't get InPlot to start under Windows.(1312)
Beware of running averages and smoothed data.(1313)
Limiting use of a Prism network license to a specified group of people.(1314)
Beware of Excel's rank() function, or nonparametric tests will be incorrect.(1315)
Will the EC50 be different if all Y values are converted to logs before fitting a log(dose) response curve?  (1316)
Common misunderstandings about P values.(1317)
P values. One-tail or two-tail ?(1318)
Exporting and copying graphs (or layouts) with clear backgrounds.(1319)
Graph-PAD, GraphPAD, GraphPad, or Prism?(1320)
How to turn off automatic snapping.(1321)
What's new in Prism Windows 5.02 and Prism Mac 5.0b?(1322)
When I use "Magic" to make graphs consistent, the axis range and intervals don't change.(1323)
Troubleshooting: What to do when Prism won't start (mac). (1324)
When I double click on one of Prism's sample data file, some other program launches.(1325)
Can Prism fit pharmacokinetic data?(1326)
The Mann-Whitney test doesn't really compare medians.(1327)
Entering a wide em-dash and en-dash in Prism.(1328)
Problems with the Goto script command.(1329)
The Standard Addition Method for determing concentrations.(1330)
Before-after graphs with different colors for different subjects.(1331)
What is the difference between an IC50 and an EC50 and an ED50?(1332)
The confidence bands of my survival curve don't extend to the last time point.(1333)
if I've purchased a full license of Prism 5, do I need to uninstall the demo version?(1334)
Graphing a Binomial or Poisson distribution with Prism. (1336)
My Prism file is too big. How can I move some sheets to a different file?(1337)
How do I set the paper size for Prism files?(1338)
How to remove all values that are too big or too small?(1339)
Those values are not outliers! They are the tail of a lognormal distribution.(1341)
How to change the font, and point size, used for data and results tables. (1342)
Fixed bug: Printing from Prism Mac 5.0 results in blank page. (1343)
Which kinds of tiff files can Prism import.(1344)
How long can a Prism script be?(1345)
Bar borders are dotted.(1346)
Fixed bug: Using AIC to compare different non-linear regresson models, Prism 5 seems to suggest that the model with the lower probability of being correct is the the preferred model to use.(1347)
After copying data from Prism, which decimal separator (comma or period) is used when the data are pasted?(1348)
How to compare two means when the groups have different standard deviations.(1349)
Troubleshooting problems with layouts(1350)
Graph tip - How to make a grouped box and whiskers plot.(1351)
Graph tip - How can I make a graph of column data that combines bars and individual data points?(1352)
The sound quality of the welcome movie tour is bad (on Prism 5 Mac). (1353)
Graph tip - How to create a column bar graph with error values (SD or SEM) calculated elsewhere and entered directly.(1354)
R2 of weighted nonlinear fits.(1355)
50% of what? How exactly are IC50 and EC50 defined?(1356)
Constraints in nonlinear regression(1357)
How to view the XY coordinates of confidence or prediction bands fit by noninear regression(1358)
When I choose any topics from Prism 5 Mac Help, the help window opens but is blank.(1359)
How to remove Prism examples?(1360)
Why do many data points lie outside the regression confidence bands?(1361)
What you can conclude when two error bars overlap (or don't)?(1362)
How does Prism round decimal values on data tables?(1364)
Fitting bacterial growth data to determine the MIC and NIC.(1365)
What does it mean when some results have e in the number?(1366)
Why is the best-fit value of the EC₅₀ very different than what I expected?(1367)
Why doesn't Prism compute R² as part of Deming regression?(1369)
Are variables like pH or log(EC50) interval or ratio?(1374)
Can Prism run on the tiny 'netbook' computers?(1375)
I've pasted Prism graphs into a Word (or PowerPoint) document but they don't show up on my computer screen. All I see is a box with a red X, or text that says {EMBED Prism 5.document}. How can I fix this?(1377)
How does Prism compute the % of total variation in two-way ANOVA?(1379)
The SD computed from tiny samples underestimate the population SD (but not by much) (1380)
The confidence interval of a standard deviation.(1381)
Why use n-1 when calculating a standard deviation?(1383)
Fixed Bug: Some functions in user-defined equations used for nonlinear regression give wrong results.(1384)
What controls the font used for printing results and data from Prism?(1385)
How to create a log file to troubleshoot problems with Prism Windows(1386)
How can I change the decimal format of the X values in a survival table?(1387)
Minor change in how Prism 5.02 and 5.0b do weighted nonlinear regression.(1388)
Using Windows Vista or Windows 7, I can't access the online help for InStat or StatMate.(1389)
When to not correct for multiple comparisons (1390)
Multiple comparison traps(1391)
Limits of Dunnett's test.(1392)
Choices for survival curve format don't stick(1393)
The FOREACH script command works through a list of files in a folder. What order are the files processed?(1394)
Book review: A great statistical encylopedias(1395)
How does Prism compute the confidence intervals of a survival curve?(1397)
Residuals from linear regression show only the mean residual, not each individual replicate.(1398)
Post tests following one-way ANOVA are incorrect when one column is entirely excluded.(1399)
Results are blank, or incomplete (missing columns).(1401)
I'm submitting an article to a journal, what format should I use for my figures?(1402)
Graph tip - How to show mean and/or error information on a before-after graph. (1403)
Graph tip - Showing error or confidence envelope(1404)
Prism tip - How can I learn to use Prism? Try the sample data tutorials.(1405)
The Pros and Cons of Using Excel for Statistical Calculations(1406)
How a Lurking Variable can Confuse Data Analysis (1407)
For one of the data sets on my graph, the legend should show a solid-color box, but it looks like there is a white line at the bottom.(1409)
Fitting radioligand binding to receptor dimers(1410)
When I try to extend the demo of GraphPad Prism to use it for 15 more days, it gives the message, "invalid demo extension code".(1411)
Prism can give different results for nonlinear regression when you ask it to identify or remove outliers -- even if no outliers are identified. (1412)
How does Prism compute the value of X at Y mid and the value of Y at Xmid?(1413)
Graph tip - Using Magic to make several graphs look the same.(1414)
Prism 5 Mac crashes while printing.Some printer-specific options are missing from the Print dialog.(1415)
Recommended book: ANOVA viewed as comparing models(1417)
Exporting images to submit to Cadmus, a company that handles publication for many journals. (1418)
Fitting the pEC50(1419)
Graph tip -- How to make an XY graph with a time-scale on the X axis?(1420)
How to export a TIF file without an Alpha channel.(1421)
StatMate won't accept zero as the proportion of event-free (surviving) subjects at the end of the study.(1422)
Graph tip - How to Individually color each line (and pair of points) on a before-after graph.(1426)
Troubleshooting writing equations on a Prism graph or layout.(1427)
Why are some values blank when I ask Prism to create a nonparametric correlation matrix?(1429)
Prism tip - Power pasting from Excel to Prism(1430)
Calculating P values from statistical ratios(1431)
Using Excel to compute a confidence interval(1432)
The NOD32 virus scanner briefly said that Prism 5.02 was infected, but it was a false positive report.

(1433)
Fixed bug: The X-axis label of a Grouped graph returns to showing Column Titles after I choose Row Titles.(1434)
Understanding the '# of subjects at risk' page of survival analysis(1435)
Why does fitting data to the allosteric EC50 shift model sometimes lead to 'ambiguous' results?(1436)
When the Prism Mac 5.0d updater doesn't actually update...(1437)
New preference in Prism 5.02 to not prompt when saving to a temporary file.(1438)
Problems when pasting values from Prism Mac into iWork Numbers or Excel.(1439)
When plotted on semi-log axes, why is an exponential decay curve not always linear?(1440)
Fixed bug: When Prism 5.02 or 5.0b extrapolates unknowns using a nonlinear standard curve, it can rarely report nonsense results.(1445)
How Prism computes the derivatives of curves.(1446)
Review of logarithms and antilogarithms(1447)
Standardizing Prism Preferences(1448)
Hill in Hell, and more. Recommended book: Drug-Acceptor Interactions (1450)
Prism tip - Using the Prism Gallery to export, copy, or print multiple graphs or layouts(1451)
How to install Prism 5. A guide for IT people.(1452)
When I try to install Prism 5 Windows, I get the error message: "An attempt was made to execute an illegal instruction (oxc000001d) Occurred in the application at location 0x7c59bcb1."(1454)
When entering data for a log(dose) response curve, should I use common (base 10) or natural (ln) logarithms?(1455)
The link GraphPad sent for me to downoad software doesn't work. I get an error message.(1456)
How is conducting a statistical analysis like riding a bicycle?(1457)
How is a family of comparisons defined for the Bonferroni multiple comparison test following two-way ANOVA?(1458)
A Prism graph object in a Prism layout or pasted into another program is way bigger than the Prism graph.(1459)
Why blatant outliers are sometimes not detected by Prism's nonlinear regression.(1460)
Problem resaving Prism .pzf or .pzfx files after making changes(1461)
High R² but useless results: Dependency and ambiguous fits.(1462)
Point of confusion: Alpha with Bonferroni correction.(1463)
The name " Wilcoxon test" can refer to four statistical tests(1464)
Will the real "logistic" please stand up. The three meanings of "logistic".(1465)
What is the difference between odds and probability?(1466)
Graph tip - When my X axis crosses Y at a point other than 0, why is there is an extra line at Y=0?(1467)
Graph tip - Combining columns and points or a curve fit on an XY graph(1469)
The probit function.(1470)
After fitting a curve with two phases or components, how to plot the individual components of a best-fit curve.(1472)
How Prism reports nonlinear regression results when the fit is perfect(1473)
Graphs with row titles next to data points seem to resize themselves and behave strangely.(1474)
Graph tip - combine points with a shaded range(1475)
Graph tip - Don't use a log scale on a bar graph!(1477)
Sigmoidal enzyme kinetics -- two forms of the model(1478)
Original citation for testing for statistical equivalence using two one-sided P values.(1480)
Five ways to plot whiskers in box and whisker plots.(1481)
Bug: Prism can freeze when fitting a model with shared parameters which don't have initial values defined.(1482)
How to move the InStat Mac window when it is party covered by the InStat toolbar.(1483)
My company or institution has a site license for Prism. I've gotten the serial number for renewal but I can't enter it.(1484)
Bug: Prism freezes or crashes when copying and pasting data from Excel(1485)
The essential concepts of statistics(1486)
Statistical Principles: The use and abuse of logarithmic axes(1487)
Message: "Prism cannot start because the serial number file cannot be saved."(1488)
Trimming or decimating to reduce the size of huge data tables.(1489)
The standard error of the difference between two means(1490)
The replicates test (1492)
How to tell Prism which display to start on.(1493)
Troubleshooting Prism Magic(1495)
How to make two frequency distributions have the same X axis limits