Hi all,   I am using proc GLM to analyze some data.  I want to specify the error term that is used to test certain factors.  In other words I don't want all the factors tested over the mean square error (MSE).  For example, imagine I have two factors A and B and their interaction A*B.  I would like to test A over A*B and B over A*B and then have A*B tested over the MSE.  I don't know how to specify the error term.  Can someone help? Here's my code: proc glm data=work.myexcel; class A B; model Y=A|B; run;   Obviously if I do it like it is currently written A and B and A*B are tested over the MSE.  I'm not having much luck finding how to do this, but I know it can be done (and I'd imagine it's pretty easy to do).  I would appreciate any help anyone can give.  Thanks!! P.S.  A and B are fixed factors, not rand if that matters at all.   ... View more