Frequencies for first 10,000 rows of contsub6 variable in nhamcsed2015 dataset 

      Controlled substance |
status code for medication |
                        #6 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         82        0.82        0.82
              Schedule III |         26        0.26        1.08
               Schedule IV |         29        0.29        1.37
                Schedule V |          3        0.03        1.40
                No control |        833        8.33        9.73
              Undetermined |          9        0.09        9.82
        Multiple schedules |          8        0.08        9.90
                         . |      9,010       90.10      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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