Greetings.
When using linear mixed models, it is possible to generate the same marginal model from use of the RANDOM statement or the REPEATED statement. You would just have to check the V matrix created by both structures. However, when you leave normality(Generalized linear mixed models) you will not yield the same marginal model.
Hope this helps.
Yes, you could try fitting a GEE model, but use PROC GEE, not PROC GENMOD. There is no guarantee though that the time and memory needed will be feasible. Be sure to specify your response distribution in the DIST= option in the MODEL statement. And the WITHIN= variable should also be in the CLASS statement.
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ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.
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