Frequencies for first 10,000 rows of contsub7 variable in namcs2015 dataset :

 Controlled |
  substance |
   code for |
 medication |
         #7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         21        0.21        0.21
          3 |         26        0.26        0.47
          4 |         33        0.33        0.80
          5 |          4        0.04        0.84
          6 |      1,569       15.69       16.53
          7 |         28        0.28       16.81
          8 |          4        0.04       16.85
          . |      8,315       83.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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