Frequencies for first 10,000 rows of contsub7 variable in namcs2012 dataset :

Controlled status code for |
              medication 7 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         13        0.13        0.13
              Schedule III |         18        0.18        0.31
               Schedule IV |         37        0.37        0.68
                Schedule V |          7        0.07        0.75
                No control |      1,032       10.32       11.07
              Undetermined |         21        0.21       11.28
        Multiple schedules |          4        0.04       11.32
                         . |      8,868       88.68      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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