I want to get diagnostic plots for a multilevel linear model I conducted with the lme function.
When I apply the plot() or plot.lme() function, only the Residuals vs Fitted plot is shown. I am specially interested in getting the Scale-Location plot too, but I cant find it.
I have already applied the command par(mfrow=c(2,2)) which would make that four diagnostic plots are shown, but still only one is showing up and I can't find the others. Does anyone have a suggestion what might be wrong?
Thanks for your help and have a nice day!