How to get rate ratio/odds ratio estimates using proc genmod exact?

[jiweihe1223]

Does SAS have an option to output rate ratio estimate from exact method in proc genmod? Or do we have to compute manually?

Proc genmod data=data;
Class Treat Sex Age;
model e = Treat Sex Age/ dist=poisson link=log offset=t;
exact Treat/joint estimate;
run;

[sbxkoenk]

Hello,

I have moved your post to the 'Statistical Procedures' board (under the Analytics header) !

Koen

[Rick_SAS]

The exact method provides the parameter estimates. You can use the LSMEANS statement to compute the rate ratio. For your data, the example might look like 

lsmeans Treat / ilink diff exp cl;

 For a full explanation about how to get rate ratios by using the LSMEANS statement, see the article "Modeling rates and estimating rates and rate ratios."

About 75% through the article is a section titled "Rate Ratio Estimates."  That section contains the information you need.

The section also shows how to use the ESTIMATE statement to estimate and test custom rate ratios 

[jiweihe1223]

Thanks. Actually my question is about the exact method. I later found the output for rate ratio or odds ratio can be obtained by adding "estimate=both"

exact Treat/joint estimate=both;