Frequencies for first 10,000 rows of contsub5 variable in namcs1996 dataset :

 controlled |
  substance |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          7        0.07        0.07
          3 |         19        0.19        0.26
          4 |         50        0.50        0.76
          5 |          4        0.04        0.80
          6 |      1,000       10.00       10.80
          7 |         21        0.21       11.01
          . |      8,899       88.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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