Frequencies for first 10,000 rows of contsub3 variable in namcs2002 dataset :

Controlled status code for |
             medication #3 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         23        0.23        0.23
              Schedule III |         27        0.27        0.50
               Schedule IV |         94        0.94        1.44
                Schedule V |          4        0.04        1.48
                No control |      1,802       18.02       19.50
              Undetermined |         65        0.65       20.15
                         . |      7,985       79.85      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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