Frequencies for first 10,000 rows of contsub5 variable in nhamcsed2002 dataset :

 controlled |
  substance |
   code for |
    drug #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         27        0.27        0.27
          3 |         18        0.18        0.45
          4 |         19        0.19        0.64
          5 |          2        0.02        0.66
          6 |        561        5.61        6.27
          7 |         29        0.29        6.56
          . |      9,344       93.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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