Is it possible to fit exact Poisson regression with robust variance in SAS?
PROC GENMOD can do Exact Poisson Ression, but not sure if it is Robust Variance.
Or Check RPOC GLIMMIX .
To me, robust and exact don't belong in the same sentence, but then, what do I know ? Genmod does exact Poisson regression. Countreg (in SAS/ETS) doesn't, but gives you more options to model the variance. Check the Conway-Maxwell-Poisson distribution option.
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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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