Frequencies for first 10,000 rows of contsub6 variable in nhamcsed2013 dataset :

      Controlled substance |
status code for medication |
                        #6 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         55        0.55        0.55
              Schedule III |         34        0.34        0.89
               Schedule IV |         31        0.31        1.20
                Schedule V |          1        0.01        1.21
                No control |        601        6.01        7.22
              Undetermined |          9        0.09        7.31
        Multiple schedules |          7        0.07        7.38
                         . |      9,262       92.62      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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