Frequencies for first 10,000 rows of contsub3 variable in nhamcsed2009 dataset :

   for rx3, |
 controlled |
  substance |
status code |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        277        2.77        2.77
          3 |        190        1.90        4.67
          4 |         84        0.84        5.51
          5 |         10        0.10        5.61
          6 |      2,241       22.41       28.02
          7 |         41        0.41       28.43
          8 |         36        0.36       28.79
          . |      7,121       71.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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