data cer3;
  input age gender $ weight;
   if gender='m' then do;
     if weight>200 then wtgrp='Heavy';
     if weight<200 then wtgrp='Medium';
     if weight<150 then wtgrp='Light';
    end;
   if gender='f' then do;
     if weight>150 then wtgrp='Heavy ';
     if weight<150 then wtgrp='Medium';
     if weight<110 then wtgrp='Light ';
    end;
 cards;
47 f 165
 7 m  65
42 f 115
32 m 200
51 f 112
60 m 145 
72 . 125
;;;;
proc print;