Frequencies for first 10,000 rows of contsub30 variable in namcs2015 dataset :

 Controlled |
  substance |
   code for |
 medication |
        #30 |      Freq.     Percent        Cum.
------------+-----------------------------------
          6 |          4        0.04        0.04
          . |      9,996       99.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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