Frequencies for first 10,000 rows of contsub1 variable in namcs1994 dataset :

 controlled |
  substance |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         60        0.60        0.60
          3 |        117        1.17        1.77
          4 |        191        1.91        3.68
          5 |         33        0.33        4.01
          6 |      6,682       66.82       70.83
          7 |        534        5.34       76.17
          . |      2,383       23.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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