Frequencies for first 10,000 rows of contsub7 variable in nhamcsed2012 dataset :

      Controlled substance |
status code for medication |
                        #7 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         20        0.20        0.20
              Schedule III |         11        0.11        0.31
               Schedule IV |         16        0.16        0.47
                No control |        336        3.36        3.83
              Undetermined |          2        0.02        3.85
        Multiple schedules |          4        0.04        3.89
                         . |      9,611       96.11      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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