Frequencies for first 10,000 rows of contsub4 variable in nhamcsed2012 dataset :

      Controlled substance |
status code for medication |
                        #4 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        140        1.40        1.40
              Schedule III |         85        0.85        2.25
               Schedule IV |         51        0.51        2.76
                Schedule V |          2        0.02        2.78
                No control |      1,485       14.85       17.63
              Undetermined |         20        0.20       17.83
        Multiple schedules |         17        0.17       18.00
                         . |      8,200       82.00      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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