Frequencies for first 10,000 rows of contsub6 variable in nhamcsed2011 dataset :

      Controlled substance |
status code for medication |
                        #6 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         54        0.54        0.54
              Schedule III |         18        0.18        0.72
               Schedule IV |         27        0.27        0.99
                Schedule V |          1        0.01        1.00
                No control |        432        4.32        5.32
              Undetermined |          5        0.05        5.37
        Multiple schedules |          4        0.04        5.41
                         . |      9,459       94.59      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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