In case others come here wondering. In my case I was receiving the same error after I had copied my code from a proc logistic step to a proc reg step. After deleting DESCENDING the code worked. ORIGINAL SAS CODE: Proc reg data=data_source DESCENDING; model dependent = V1 V2 V3 V4; TITLE "F"; run; MODIFIED SAS CODE: Proc reg data=data_source; model dependent = V1 V2 V3 V4; TITLE "F"; run;
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