Frequencies for first 10,000 rows of contsub24 variable in namcs2014 dataset :

 Controlled substance code |
        for medication #24 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule IV |          4        0.04        0.04
                No control |         19        0.19        0.23
              Undetermined |          3        0.03        0.26
        Multiple schedules |          1        0.01        0.27
                         . |      9,973       99.73      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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