Hey there, I am using the following code to test an interaction with PROC LOGISTIC: proc logistic data=aim1; class group (param=ref ref='Usual_Care') surveycomp (param=ref ref='No'); model init1stapp (event='Yes')= group surveycomp group*surveycomp/expb lackfit; oddsratio surveycomp; run; When the Wald Odds Ratio table is produced, the reference group for surveycomp = "Yes". surveycomp No vs Yes at group=Intervention 0.349 0.228 0.535 surveycomp No vs Yes at group=Usual_Care 0.508 0.333 0.776 I'd prefer the reference group be the same as in the class statement (surveycomp = "No"). Is there a way to specify this in the ODDSRATIO statement? Thanks so much! -J
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