Frequencies for first 10,000 rows of contsub5 variable in nhamcsed1995 dataset :

 controlled |
  substance |
   code for |
    drug #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          9        0.09        0.09
          3 |          9        0.09        0.18
          4 |         15        0.15        0.33
          5 |          2        0.02        0.35
          6 |        328        3.28        3.63
          7 |         14        0.14        3.77
          . |      9,623       96.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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