Ignore points outside of a specified X range

If you choose these options nonlinear regression will completely ignore all data where the X value is less than, or larger than, the thresholds you set. This could be useful if you collect data over time, and only want to fit data within a certain range of time points.

Define the curve

In addition to fitting the model to your data, Prism also superimposes the curve on your graph. Choose where the curves should begin and end.

Table of XY coordinates

Check this option if you want to see a table of XY coordinates of line segments defining the curve.

In prior versions of Prism, this table was critical to plotting the curve and interpolating unknowns. But Prism 5 can graph the curve and interpolate unknowns from the curve, without creating this table. Check the option to create this table only if you want to copy (or export) the table into another program. In most cases, you will have no need to view this table, and so should leave the option unchecked.