Frequencies for first 10,000 rows of contsub21 variable in namcs2014 dataset :

 Controlled substance code |
        for medication #21 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          1        0.01        0.01
               Schedule IV |          2        0.02        0.03
                No control |         56        0.56        0.59
              Undetermined |          6        0.06        0.65
        Multiple schedules |          1        0.01        0.66
                         . |      9,934       99.34      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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