Frequencies for first 10,000 rows of contsub8 variable in nhamcsed2011 dataset :

      Controlled substance |
status code for medication |
                        #8 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         15        0.15        0.15
              Schedule III |          2        0.02        0.17
               Schedule IV |          8        0.08        0.25
                No control |        179        1.79        2.04
              Undetermined |          1        0.01        2.05
        Multiple schedules |          2        0.02        2.07
                         . |      9,793       97.93      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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