Frequencies for first 10,000 rows of contsub2 variable in nhamcsed2013 dataset :

      Controlled substance |
status code for medication |
                        #2 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        418        4.18        4.18
              Schedule III |        195        1.95        6.13
               Schedule IV |        164        1.64        7.77
                Schedule V |          3        0.03        7.80
                No control |      4,463       44.63       52.43
              Undetermined |         56        0.56       52.99
        Multiple schedules |         30        0.30       53.29
                         . |      4,671       46.71      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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