Frequencies for first 10,000 rows of contsub4 variable in nhamcsed2009 dataset :

   for rx4, |
 controlled |
  substance |
status code |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        157        1.57        1.57
          3 |         77        0.77        2.34
          4 |         70        0.70        3.04
          5 |          3        0.03        3.07
          6 |      1,205       12.05       15.12
          7 |          9        0.09       15.21
          8 |         13        0.13       15.34
          . |      8,466       84.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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