Frequencies for first 10,000 rows of contsub1 variable in nhamcsed2013 dataset :

      Controlled substance |
status code for medication |
                        #1 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        594        5.94        5.94
              Schedule III |        299        2.99        8.93
               Schedule IV |        211        2.11       11.04
                Schedule V |          7        0.07       11.11
                No control |      6,417       64.17       75.28
              Undetermined |         70        0.70       75.98
        Multiple schedules |         59        0.59       76.57
                         . |      2,343       23.43      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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