Frequencies for first 10,000 rows of contsub13 variable in namcs2015 dataset :

 Controlled |
  substance |
   code for |
 medication |
        #13 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          1        0.01        0.01
          3 |          5        0.05        0.06
          4 |         11        0.11        0.17
          6 |        369        3.69        3.86
          7 |          3        0.03        3.89
          8 |          1        0.01        3.90
          . |      9,610       96.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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