Frequencies for first 10,000 rows of contsub5 variable in namcs2000 dataset :

 controlled |
  substance |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          8        0.08        0.08
          3 |          6        0.06        0.14
          4 |         18        0.18        0.32
          6 |        647        6.47        6.79
          7 |         29        0.29        7.08
          . |      9,292       92.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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