Frequencies for first 10,000 rows of contsub8 variable in nhamcsed2013 dataset :

      Controlled substance |
status code for medication |
                        #8 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         13        0.13        0.13
              Schedule III |          5        0.05        0.18
               Schedule IV |          7        0.07        0.25
                No control |        224        2.24        2.49
        Multiple schedules |          3        0.03        2.52
                         . |      9,748       97.48      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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