Frequencies for first 10,000 rows of contsub7 variable in nhamcsed2014 dataset :

      Controlled substance |
status code for medication |
                        #7 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         36        0.36        0.36
              Schedule III |         15        0.15        0.51
               Schedule IV |         18        0.18        0.69
                Schedule V |          1        0.01        0.70
                No control |        444        4.44        5.14
              Undetermined |          4        0.04        5.18
        Multiple schedules |          5        0.05        5.23
                         . |      9,477       94.77      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017