Frequencies for first 10,000 rows of contsub5 variable in namcs1997 dataset :

 controlled |
  substance |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          7        0.07        0.07
          3 |         12        0.12        0.19
          4 |         51        0.51        0.70
          5 |          1        0.01        0.71
          6 |        893        8.93        9.64
          7 |          9        0.09        9.73
          . |      9,027       90.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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