Frequencies for first 10,000 rows of consuba2 variable in nhamcsed2002 dataset :

 controlled |
  substance |
   code for |
    adverse |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         10        0.10        0.10
          2 |         29        0.29        0.39
          3 |          2        0.02        0.41
          4 |          1        0.01        0.42
          6 |         21        0.21        0.63
          7 |          7        0.07        0.70
          . |      9,930       99.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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