/* Example 4-1 */

options linesize=80 pagesize=54 pageno=1;

data students;
        input gender $ age grade;
        cards;
        m 22 86
        f 21 81
        f 35 92
        f 20 55
        m 22 41
        m 22 71
        f 20 79
        f 19 66
        m 20 98
        f 21 89
        f 19 71
        m 20 31
        m 21 82
        f 20 71
        f 18 91
        ;
run;

proc freq data=students;
        tables age gender grade;
run;

proc freq data=students;
        tables gender*age;
run;