Frequencies for first 10,000 rows of contsub3 variable in namcs2012 dataset :

Controlled status code for |
              medication 3 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         89        0.89        0.89
              Schedule III |         48        0.48        1.37
               Schedule IV |        140        1.40        2.77
                Schedule V |         18        0.18        2.95
                No control |      3,069       30.69       33.64
              Undetermined |         94        0.94       34.58
        Multiple schedules |          9        0.09       34.67
                         . |      6,533       65.33      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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