Frequencies for first 10,000 rows of contsub7 variable in nhamcsed2015 dataset 

      Controlled substance |
status code for medication |
                        #7 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         35        0.35        0.35
              Schedule III |         17        0.17        0.52
               Schedule IV |         18        0.18        0.70
                Schedule V |          1        0.01        0.71
                No control |        565        5.65        6.36
              Undetermined |          6        0.06        6.42
        Multiple schedules |          5        0.05        6.47
                         . |      9,353       93.53      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017