Table 5.

Lines 39–54.

Line	Code
39.	PROC FREQ NOPRINT DATA = matches;
40.	TABLES case_age*case_gender/OUT = con_out;
41.	PROC SORT DATA = caseout(RENAME =
	(age = case_age gender = case_gender
	count = case_cnt));
42.	BY case_age case_gender;
43.	PROC SORT DATA = con_out (RENAME = (count = con_cnt));
44.	BY case_age case_gender;
45.	DATA final (DROP = percent);
46.	MERGE caseout con_out;
47.	BY case_age case_gender;
48.	con_need = case_cnt*∶
49.	IF con_cnt = . THEN con_cnt = 0;
50.	diff = con_cnt-con_need;
51.	PROC PRINT DATA = final;
52.	WHERE diff< 0;
53.	TITLE ‘Insufficient Matches’;
54.	RUN;

To investigate whether all cases have received the desired amount of matched controls, the code in this table may be used. It results in a table showing the cases missing one or more matched controls.