DATA CHD;
        INPUT AGE $ 1-4 ECG $ 7 CHD $ 10-12 CAT $ 14-16 WT 18-20;
        CARDS;

<55   0  YES YES 1
<55   0  YES NO  17
<55   0  NO  YES 7
<55   0  NO  NO  257
<55   1  YES YES 3
<55   1  YES NO  7
<55   1  NO  YES 14
<55   1  NO  NO  52
55+   0  YES YES 9
55+   0  YES NO  15
55+   0  NO  YES 30
55+   0  NO  NO  107
55+   1  YES YES 14
55+   1  YES NO  5
55+   1  NO  YES 44
55+   1  NO  NO  27
;
PROC FREQ ORDER=DATA;
        WEIGHT WT;
        TABLES AGE*ECG*CAT*CHD/ALL;