Frequencies for first 10,000 rows of contsub9 variable in nhamcsed2015 dataset 

      Controlled substance |
status code for medication |
                        #9 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         16        0.16        0.16
              Schedule III |          5        0.05        0.21
               Schedule IV |         13        0.13        0.34
                Schedule V |          1        0.01        0.35
                No control |        293        2.93        3.28
              Undetermined |          2        0.02        3.30
                         . |      9,670       96.70      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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