Frequencies for first 10,000 rows of contsub2 variable in namcs2015 dataset :

 Controlled |
  substance |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         80        0.80        0.80
          3 |         74        0.74        1.54
          4 |        176        1.76        3.30
          5 |          6        0.06        3.36
          6 |      4,748       47.48       50.84
          7 |         94        0.94       51.78
          8 |         24        0.24       52.02
          . |      4,798       47.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017