This paper demonstrates that by exploiting the concept of estimable functions both tasks can be completed easily and conveniently in one run of the SAS/STAT(R) GLM procedure.Louis MunyakaziTrilogy Consulting Corporation
we would fail to reject the null hypothesis thatfemaleandprogdo not interact. Based on this finding, some would advise rerunning the model without the interaction term, including only the main effects in the model (and the intercept). This would in turn permit a valid interpretation of the ...
Nothing to fix, SAS has done the proper job here. What needs to change is the interpretation that you make of it. When you have a class variable, you will ALWAYS get one level set to zero, with no confidence intervals. That's the way things work with class var...
. Using the GLM procedure of SAS as a convenient software tool, the technique is illustrated by several examples. It is concluded that GLM provides a most suitable approach for the interpretation of stability data.doi:10.3109/03639049109043817...