Frequencies for first 10,000 rows of contsub3 variable in nhamcsed2015 dataset 

      Controlled substance |
status code for medication |
                        #3 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        267        2.67        2.67
              Schedule III |        121        1.21        3.88
               Schedule IV |         98        0.98        4.86
                Schedule V |          7        0.07        4.93
                No control |      3,223       32.23       37.16
              Undetermined |         60        0.60       37.76
        Multiple schedules |         29        0.29       38.05
                         . |      6,195       61.95      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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