[R] Adjusted Rate Ratios in R

[matthew.benigni]

I am trying to calculate Poisson regression based adjusted rate ratios in R,
but R's default in glm does not code the intercept as the global rate.  In
SAS I use "cell means" coding so that the intercept is the global rate, but
I do not know how to do this in R.  If anyone knows a way to make glm use
"cell means", or an how to find adjusted rate ratios I would be grateful.

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