Frequencies for first 10,000 rows of contsub9 variable in namcs2012 dataset :

 Controlled substance code |
         for medication #9 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          7        0.07        0.07
              Schedule III |         12        0.12        0.19
               Schedule IV |         17        0.17        0.36
                Schedule V |          1        0.01        0.37
                No control |        657        6.57        6.94
              Undetermined |         17        0.17        7.11
                         . |      9,289       92.89      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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