Frequencies for first 10,000 rows of contsub2 variable in namcs2014 dataset :

 Controlled substance code |
         for medication #2 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        146        1.46        1.46
              Schedule III |        105        1.05        2.51
               Schedule IV |        231        2.31        4.82
                Schedule V |         18        0.18        5.00
                No control |      5,047       50.47       55.47
              Undetermined |        154        1.54       57.01
        Multiple schedules |         24        0.24       57.25
                         . |      4,275       42.75      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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