07-12-2016 06:55 AM
07-12-2016 02:01 PM
Collinearity will more likely occur between CLASS variables when some class combinations are empty (i.e. if all males are right-handed in your data there is no way to estimate the left-handed male effect). If you can't find where the problem is, you can get collinearity diagnosis with proc reg after expanding your design matrix (create dummy variables for class effects) with proc glmmod.