Follow the documentation example then: https://documentation.sas.com/?docsetId=statug&docsetTarget=statug_logistic_examples02.htm&docsetVersion=14.3&locale=en I would recommend running the documentation example first, make sure you understand it and then try it with your own data. The example doesn't do one thing I would recommend, set the class variables to have the REF parameterization. class <list of categorical variables> / param=ref;
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