Frequencies for first 10,000 rows of contsub7 variable in nhamcsed2009 dataset :

   for rx7, |
 controlled |
  substance |
status code |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         16        0.16        0.16
          3 |         14        0.14        0.30
          4 |         10        0.10        0.40
          6 |        222        2.22        2.62
          7 |          5        0.05        2.67
          . |      9,733       97.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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