Frequencies for first 10,000 rows of contsub4 variable in nhamcsed2015 dataset 

      Controlled substance |
status code for medication |
                        #4 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        162        1.62        1.62
              Schedule III |         77        0.77        2.39
               Schedule IV |         65        0.65        3.04
                Schedule V |          5        0.05        3.09
                No control |      2,067       20.67       23.76
              Undetermined |         34        0.34       24.10
        Multiple schedules |         18        0.18       24.28
                         . |      7,572       75.72      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017