Frequencies for first 10,000 rows of contsub2 variable in namcs2012 dataset :

Controlled status code for |
              medication 2 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        112        1.12        1.12
              Schedule III |         99        0.99        2.11
               Schedule IV |        217        2.17        4.28
                Schedule V |         26        0.26        4.54
                No control |      4,201       42.01       46.55
              Undetermined |        189        1.89       48.44
        Multiple schedules |         10        0.10       48.54
                         . |      5,146       51.46      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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