HI @dkeine Welcome to the SAS forum. In addition to the correction you received , since your conditions are mutually exclusive, you are better off adding a else if
data DID.MLIP101;
set DID.MLIP1;
IF Antidepressants__ gt 0 THEN ADM_YN= "y";
else IF Antidepressants__ = 0 THEN ADM_YN= "n";/*else if*/
run;
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