Frequencies for first 10,000 rows of contsub5 variable in namcs1999 dataset :

 controlled |
  substance |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          8        0.08        0.08
          3 |         11        0.11        0.19
          4 |         34        0.34        0.53
          5 |          1        0.01        0.54
          6 |        631        6.31        6.85
          7 |         14        0.14        6.99
          . |      9,301       93.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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