Frequencies for first 10,000 rows of contsub1 variable in nhamcsed2009 dataset :

   for rx1, |
 controlled |
  substance |
status code |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        728        7.28        7.28
          3 |        482        4.82       12.10
          4 |        257        2.57       14.67
          5 |         10        0.10       14.77
          6 |      6,074       60.74       75.51
          7 |         67        0.67       76.18
          8 |         76        0.76       76.94
          . |      2,306       23.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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