Frequencies for first 10,000 rows of contsub5 variable in nhamcsopd2011 dataset :

      Controlled substance |
status code for Medication |
                        #5 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         46        0.46        0.46
              Schedule III |         10        0.10        0.56
               Schedule IV |         54        0.54        1.10
                Schedule V |         11        0.11        1.21
                No control |      1,927       19.27       20.48
              Undetermined |         24        0.24       20.72
        Multiple schedules |          2        0.02       20.74
                         . |      7,926       79.26      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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