Frequencies for first 10,000 rows of contsub3 variable in nhamcsed2012 dataset :

      Controlled substance |
status code for medication |
                        #3 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        254        2.54        2.54
              Schedule III |        126        1.26        3.80
               Schedule IV |         79        0.79        4.59
                Schedule V |          1        0.01        4.60
                No control |      2,573       25.73       30.33
              Undetermined |         41        0.41       30.74
        Multiple schedules |         35        0.35       31.09
                         . |      6,891       68.91      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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