Frequencies for first 10,000 rows of contsub3 variable in nhamcsed2013 dataset :

      Controlled substance |
status code for medication |
                        #3 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        298        2.98        2.98
              Schedule III |        127        1.27        4.25
               Schedule IV |         97        0.97        5.22
                Schedule V |          4        0.04        5.26
                No control |      2,715       27.15       32.41
              Undetermined |         41        0.41       32.82
        Multiple schedules |         21        0.21       33.03
                         . |      6,697       66.97      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016