Frequencies for first 10,000 rows of contsub10 variable in namcs2015 dataset :

 Controlled |
  substance |
   code for |
 medication |
        #10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          7        0.07        0.07
          3 |          6        0.06        0.13
          4 |         33        0.33        0.46
          5 |          4        0.04        0.50
          6 |        763        7.63        8.13
          7 |         13        0.13        8.26
          8 |          2        0.02        8.28
          . |      9,172       91.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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