GraphPad Statistics Guide

QQ plot

QQ plot

Previous topic Next topic No expanding text in this topic  

QQ plot

Previous topic Next topic JavaScript is required for expanding text JavaScript is required for the print function Mail us feedback on this topic!  

When you run a normality test on column data or on residuals, Prism (new with Prism 8) can plot a QQ plot. There are multiple ways to label the axes of such graphs. Prism plots the actual Y values on the horizontal axis, and the predicted Y values (assuming sampling from a Gaussian distribution) on the Y axis. If the data were sampled from a Gaussian (normal) distribution, you expect the points to follow a straight line that matches the line of identity (which Prism shows).

Example QQ plot: