Frequencies for first 10,000 rows of contsub12 variable in nhamcsed2013 dataset :

      Controlled substance |
status code for medication |
                       #12 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          5        0.05        0.05
              Schedule III |          1        0.01        0.06
                No control |         51        0.51        0.57
        Multiple schedules |          1        0.01        0.58
                         . |      9,942       99.42      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016