Frequencies for first 10,000 rows of contsub7 variable in namcs2013 dataset :

 Controlled substance code |
         for medication #7 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         19        0.19        0.19
              Schedule III |         17        0.17        0.36
               Schedule IV |         50        0.50        0.86
                Schedule V |          8        0.08        0.94
                No control |      1,418       14.18       15.12
              Undetermined |         46        0.46       15.58
        Multiple schedules |          1        0.01       15.59
                         . |      8,441       84.41      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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