Frequencies for first 10,000 rows of consuba1 variable in nhamcsed2002 dataset :

 controlled |
  substance |
   code for |
    adverse |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         36        0.36        0.36
          2 |         64        0.64        1.00
          3 |          4        0.04        1.04
          4 |          7        0.07        1.11
          6 |        254        2.54        3.65
          7 |         36        0.36        4.01
          . |      9,599       95.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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