Frequencies for first 10,000 rows of contsub2 variable in nhamcsed2012 dataset :

      Controlled substance |
status code for medication |
                        #2 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        398        3.98        3.98
              Schedule III |        209        2.09        6.07
               Schedule IV |        164        1.64        7.71
                Schedule V |          5        0.05        7.76
                No control |      4,247       42.47       50.23
              Undetermined |         52        0.52       50.75
        Multiple schedules |         52        0.52       51.27
                         . |      4,873       48.73      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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