Frequencies for first 10,000 rows of contsub9 variable in nhamcsed2014 dataset :

      Controlled substance |
status code for medication |
                        #9 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         16        0.16        0.16
              Schedule III |          5        0.05        0.21
               Schedule IV |          9        0.09        0.30
                No control |        229        2.29        2.59
              Undetermined |          3        0.03        2.62
        Multiple schedules |          2        0.02        2.64
                         . |      9,736       97.36      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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