Frequencies for first 10,000 rows of contsub8 variable in namcs2013 dataset :

 Controlled substance code |
         for medication #8 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          7        0.07        0.07
              Schedule III |         20        0.20        0.27
               Schedule IV |         41        0.41        0.68
                Schedule V |          4        0.04        0.72
                No control |      1,150       11.50       12.22
              Undetermined |         28        0.28       12.50
        Multiple schedules |          1        0.01       12.51
                         . |      8,749       87.49      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017