Frequencies for first 10,000 rows of contsub6 variable in nhamcsed2012 dataset :

      Controlled substance |
status code for medication |
                        #6 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         40        0.40        0.40
              Schedule III |         20        0.20        0.60
               Schedule IV |         20        0.20        0.80
                No control |        535        5.35        6.15
              Undetermined |         10        0.10        6.25
        Multiple schedules |          5        0.05        6.30
                         . |      9,370       93.70      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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