Frequencies for first 10,000 rows of contsub7 variable in namcs2014 dataset :

 Controlled substance code |
         for medication #7 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         23        0.23        0.23
              Schedule III |         25        0.25        0.48
               Schedule IV |         54        0.54        1.02
                Schedule V |          3        0.03        1.05
                No control |      1,680       16.80       17.85
              Undetermined |         36        0.36       18.21
        Multiple schedules |          2        0.02       18.23
                         . |      8,177       81.77      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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