Frequencies for first 10,000 rows of comstat4 variable in namcs1993 dataset :

composition |
status code |
        for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        827        8.27        8.27
          2 |        108        1.08        9.35
          3 |         28        0.28        9.63
          . |      9,037       90.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016