Frequencies for first 10,000 rows of contsub5 variable in namcs1993 dataset :

 controlled |
  substance |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          2        0.02        0.02
          3 |          7        0.07        0.09
          4 |         19        0.19        0.28
          5 |          1        0.01        0.29
          6 |        473        4.73        5.02
          7 |         10        0.10        5.12
          . |      9,488       94.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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