I have an outcome frequency over a variable number of years per patient. I have converted this to a rate per year and would like to investigate differences bet a certain category. The rates are overdispersed and zero inflated. How can I code a zero inflated negative binomial model in SAS for this rate outcome?
PROC GENMOD
what about countreg?
e.g:
proc countreg data=data;
model rate = category covariate / dist=zinb method=qn;
zeromodel rate ~ category covariate;
run;
I was not sure how to model the zeromodel..
I don't know PROC COUNTREG is under SAS/ETS, it is for time series.
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