Frequencies for first 10,000 rows of contsub10 variable in namcs2012 dataset :

 Controlled substance code |
        for medication #10 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         14        0.14        0.14
              Schedule III |         10        0.10        0.24
               Schedule IV |         15        0.15        0.39
                Schedule V |          2        0.02        0.41
                No control |        439        4.39        4.80
              Undetermined |         19        0.19        4.99
        Multiple schedules |          1        0.01        5.00
                         . |      9,500       95.00      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016