Frequencies for first 10,000 rows of contsub3 variable in nhamcsed2011 dataset :

      Controlled substance |
status code for medication |
                        #3 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        293        2.93        2.93
              Schedule III |        134        1.34        4.27
               Schedule IV |         96        0.96        5.23
                Schedule V |          7        0.07        5.30
                No control |      2,415       24.15       29.45
              Undetermined |         26        0.26       29.71
        Multiple schedules |         24        0.24       29.95
                         . |      7,005       70.05      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016