Frequencies for first 10,000 rows of contsub1 variable in nhamcsed2012 dataset :

      Controlled substance |
status code for medication |
                        #1 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        595        5.95        5.95
              Schedule III |        298        2.98        8.93
               Schedule IV |        192        1.92       10.85
                Schedule V |          5        0.05       10.90
                No control |      6,266       62.66       73.56
              Undetermined |         73        0.73       74.29
        Multiple schedules |         75        0.75       75.04
                         . |      2,496       24.96      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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