Frequencies for first 10,000 rows of contsub5 variable in namcs1994 dataset :

 controlled |
  substance |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          2        0.02        0.02
          3 |         10        0.10        0.12
          4 |         19        0.19        0.31
          5 |          3        0.03        0.34
          6 |        546        5.46        5.80
          7 |         23        0.23        6.03
          . |      9,397       93.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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