Frequencies for first 10,000 rows of contsub1 variable in namcs1998 dataset :

 controlled |
  substance |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         79        0.79        0.79
          3 |        108        1.08        1.87
          4 |        166        1.66        3.53
          5 |         38        0.38        3.91
          6 |      5,911       59.11       63.02
          7 |        199        1.99       65.01
          . |      3,499       34.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016