Frequencies for first 10,000 rows of contsub8 variable in nhamcsed2012 dataset :

      Controlled substance |
status code for medication |
                        #8 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         15        0.15        0.15
              Schedule III |         14        0.14        0.29
               Schedule IV |          4        0.04        0.33
                No control |        240        2.40        2.73
              Undetermined |          2        0.02        2.75
        Multiple schedules |          1        0.01        2.76
                         . |      9,724       97.24      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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