GraphPad Software

Free update to Prism Mac 5.0f for people who use Lion or Mountain Lion

Tue, 28 Aug 2012 22:08:00 GMT

Updates Prism 5 mac so it runs better on Lion and Mountain Lion.

Prism Windows 6.01 update is ready

Wed, 03 Oct 2012 07:00:00 GMT

This update fixes a major problem with activation, plus a few minor problems.

A peculiar prevalence of p values just below .05

Tue, 21 Aug 2012 07:00:00 GMT

Does the "P<0.05" threshold lead investigators to cut some corners? To find out, Masicampo and Lalande(1) systematically reviewed many articles in three highly regarded, and peer reviewed, psychology journals. They recorded the value of each P value, and computed the P value when it was not reported. The distribution of 3627 P values is shown below.

New in Prism 6: “Exact” P values from multiple comparisons tests

Wed, 01 Aug 2012 07:00:00 GMT

How to report “exact” P values from multiple comparisons tests? Many have asked, due to instructions to authors for many journals that recommend reporting exact P values rather than inequalities (P<0.05) but don’t distinguish simple statistical results from multiple comparisons tests. Prism 6 can do what you want.

New in Prism 6: Easier interpolation

Tue, 17 Jul 2012 07:00:00 GMT

Nonlinear regression is used for two distinct goals, fitting models and interpolating unknow values. For the latter goal, Prism has lot of distractions. Only one of the eight tabs of the nonlinear regression dialog helpful. Prism 6 simplifies.

New in Prism 6: Kolmogorov-Smirnov test

Wed, 01 Aug 2012 07:00:00 GMT

At several neurosciences meetings, Prism users repeatedly told me that their nonparametric test of choice to compare two unpaired groups is the Kolmogorov-Smirnov test, rather than the Mann-Whitney test. We added this test to Prism 6, which now offers two nonparametric tests to compare two unpaired groups.

New in Prism 6: Scaling factors in layouts

Mon, 13 Aug 2012 07:00:00 GMT

An important change in Prism 6 is so subtle, all you'll notice is less frustration.

New in Prism 6: Faster nonparametric tests

Mon, 20 Aug 2012 07:00:00 GMT

Way faster!!! When you asked Prism 5 to compute the nonparametric correlation between two variables using the Spearman test, exact calculations could be slow, taking many minutes in some cases.

Statistical significance defined using the five sigma standard

Thu, 23 Aug 2012 07:00:00 GMT

While many fields of science use P<0.05 as their definition of statistically signfiicant, particle physics uses a much stricter threshold.

The Look Elsewhere Effect

Mon, 27 Aug 2012 07:00:00 GMT

Another form of the ubiquitous multiple comparisons problem.

New in Prism 6: Pie charts and more

Mon, 27 Aug 2012 07:00:00 GMT

A new kind of data table, and new graphs, for Parts of Whole data.

Testing for equivalence

Mon, 10 Sep 2012 07:00:00 GMT

In most experimental situations, your goal is to show that one treatment is better than another. But in some situations, your goal is just the opposite -- to prove that a one treatment is indistinguishable from another.

New in Prism 6: Another use for the magic wand icon

Mon, 03 Sep 2012 07:00:00 GMT

Analyze and graph a new data table just like you already analyzed and graphed an existing table.

Prism is for undergraduates too.

Mon, 23 Jul 2012 14:38:00 GMT

We designed Prism mostly for graduate students, post-docs, and researchers. But some undergraduates use it too.

Your colleagues can view Prism files using the free Prism viewer

Mon, 01 Oct 2012 07:00:00 GMT

Free. Doesn't expire. View everything, including analysis choices.