Frequencies for first 10,000 rows of contsub2 variable in nhamcsed2015 dataset 

      Controlled substance |
status code for medication |
                        #2 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        398        3.98        3.98
              Schedule III |        213        2.13        6.11
               Schedule IV |        170        1.70        7.81
                Schedule V |          9        0.09        7.90
                No control |      4,829       48.29       56.19
              Undetermined |         65        0.65       56.84
        Multiple schedules |         31        0.31       57.15
                         . |      4,285       42.85      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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