Nothing goes wrong but SAS does not output OR's when interaction terms are included in the model. If the interaction term is significant you may (must) present stratum specific OR's and you can get those by the ESTIMATE statement. (If the interaction term is not significant, you remove it from the model again and will get the OR's you need). Simple(st) example: PROC LOGISTIC DATA=one DESCENDING; CLASS e f / PARAM=REF REF=FIRST; MODEL d = e f e*f; ESTIMATE 'OR for E in stratum F=1' e 1 e*f 1/EXP; ESTIMATE 'OR for E in stratum F=0' e 1 e*f 0/EXP; * or just e 1; ESTIMATE 'OR for F in stratum E=1' f 1 e*f 1/EXP; ESTIMATE 'OR for F in stratum E=0' f 1 e*f 0/EXP; * or just f 1; RUN; Hope this helps. k
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