In Proc GLM is ok to use the VIF but in MIXED there is no Rsq.
Multicollinearity is a dependency in the X matrix. Any of the procedures that calculate VIF can be used to get a measure of multicollinearity--PROC REG probably is the most appropriate due to the richness of options. See the responses in the thread:
https://communities.sas.com/message/170160#170160
Steve Denham
Try using COLLIN also as option in GLM.
Thanks,
Naresh
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