Nevermind, I realize the error. I tried using double quote rather than single quote, and that worked. Thank you so much! ... View more

I removed the brackets, and added the 'C' function for the continuous method, and I still get the same error messages. Here is the revised code: if DOB NE . and EXAMDATE ne . then do; AGE_EXAM_MO= intck(‘MONTH’,DOB,EXAMDATE,'C'); FORMAT CHILDDOB AGDEXAMDATE MMDDYY10.; And this is the error message: 8643 DATA EXAMAGE; 8644 SET MERGEDOB; 8645 /*CREATE AGE AT EXAM*/ 8646 if DOB NE . and EXAMDATE ne . then do; 8647 AGE_EXAM_MO= intck(‘MONTH’,DOB,EXAMDATE,'C'); - 386 200 76 ERROR 386-185: Expecting an arithmetic expression. ERROR 200-322: The symbol is not recognized and will be ignored. ERROR 76-322: Syntax error, statement will be ignored. ... View more