I have found my error. I have put all my variables into class option, but it is not possible if they are not with the same reference. The code works fine now. proc logistic data=MaBib.MaTable plots(only)=oddsratio(range=clip) ; class EVA (param=ref ref='1') ; model categoryKarasek2 = EVA / covb ; effectplot / individual polybar ; title 'Multiple Response Karasek Category Experiment' ; run ; ods graphics off ; Many thanks, Darina Proshenska
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