Frequencies for first 10,000 rows of contsub5 variable in nhamcsed1997 dataset :

 controlled |
  substance |
   code for |
    drug #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         16        0.16        0.16
          3 |          9        0.09        0.25
          4 |         16        0.16        0.41
          5 |          1        0.01        0.42
          6 |        382        3.82        4.24
          7 |         14        0.14        4.38
          . |      9,562       95.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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