Frequencies for first 10,000 rows of contsub2 variable in nhamcsed2009 dataset :

   for rx2, |
 controlled |
  substance |
status code |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        428        4.28        4.28
          3 |        293        2.93        7.21
          4 |        187        1.87        9.08
          5 |         12        0.12        9.20
          6 |      4,019       40.19       49.39
          7 |         67        0.67       50.06
          8 |         53        0.53       50.59
          . |      4,941       49.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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