Frequencies for first 10,000 rows of contsub5 variable in nhamcsed1992 dataset :

 Controlled |
  substance |
   code for |
    drug #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         12        0.12        0.12
          3 |          5        0.05        0.17
          4 |         12        0.12        0.29
          5 |          1        0.01        0.30
          6 |        194        1.94        2.24
          7 |         17        0.17        2.41
          . |      9,759       97.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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