Frequencies for first 10,000 rows of contsub7 variable in nhamcsed2013 dataset :

      Controlled substance |
status code for medication |
                        #7 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         29        0.29        0.29
              Schedule III |         10        0.10        0.39
               Schedule IV |         12        0.12        0.51
                No control |        375        3.75        4.26
              Undetermined |          7        0.07        4.33
        Multiple schedules |          5        0.05        4.38
                         . |      9,562       95.62      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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