I used OUTPUT statement as below. For the IF statement, no OUTPUT used. For the ELSE statement, there is an OUTPUT statement. However, the results showed that cases with age<=30 are in fact not in the dataset work.a. Is this caused by the OUTPUT statement? But the OUTPUT statement is enclosed in the ELSE, and should not affect the IF condition. I must be wrong?
IF (age>30) THEN status='mature';
For some self-initiated desk-checking, consider adding the SAS program line below (add the code-line one or more places with "nn" identification as unique string to generate much more info to your SASLOG so you can interrogate the processing flow:
PUTLOG '>DIAG-nn' / _ALL_;
Otherwise, you will want to share your SAS log, not a selected portion of your program.