I'm using SAS 9.4 and I'm running a generalized logit model in proc logistic (stepwise selection) and my outcome variable has 4 levels: A, B, C, and D. How can I set up my code such that the odds ratio compares A to B, B to C, C to D? Right now SAS default compares A to B, A to C, A to D. proc logistic data=data1 descending; class sex(ref='M') /param=ref; model levels=weight age sex height /slstay=0.05 slentry=0.05 scale=none selection=stepwise aggregate link=glogit; run;
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