QQ Plot behavior under factor coding and no-intercept model
Hi everyone, When I fit a model in JMP using factor coding and set the model to no intercept, I noticed that the residual normal quantile plot (QQ plot) behaves differently compared to the version with an intercept. Specifically, the residuals and the fitted “robust fit line” in the QQ plot seem to shift vertically, and even after centering the residuals, the slope of the fitted line changes sligh...