Frequencies for first 10,000 rows of contsub5 variable in namcs2013 dataset :

 Controlled substance code |
         for medication #5 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         28        0.28        0.28
              Schedule III |         38        0.38        0.66
               Schedule IV |         78        0.78        1.44
                Schedule V |         15        0.15        1.59
                No control |      2,241       22.41       24.00
              Undetermined |         65        0.65       24.65
        Multiple schedules |          5        0.05       24.70
                         . |      7,530       75.30      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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