Frequencies for first 10,000 rows of contsub4 variable in nhamcsed2014 dataset :

      Controlled substance |
status code for medication |
                        #4 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        159        1.59        1.59
              Schedule III |         70        0.70        2.29
               Schedule IV |         63        0.63        2.92
                Schedule V |          2        0.02        2.94
                No control |      1,774       17.74       20.68
              Undetermined |         19        0.19       20.87
        Multiple schedules |         27        0.27       21.14
                         . |      7,886       78.86      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017