Frequencies for first 10,000 rows of contsub7 variable in nhamcsopd2011 dataset :

      Controlled substance |
status code for Medication |
                        #7 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         22        0.22        0.22
              Schedule III |          5        0.05        0.27
               Schedule IV |         34        0.34        0.61
                Schedule V |          3        0.03        0.64
                No control |      1,166       11.66       12.30
              Undetermined |         19        0.19       12.49
        Multiple schedules |          1        0.01       12.50
                         . |      8,750       87.50      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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