Frequencies for first 10,000 rows of contsub4 variable in namcs2002 dataset :

Controlled status code for |
             medication #4 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          7        0.07        0.07
              Schedule III |         16        0.16        0.23
               Schedule IV |         52        0.52        0.75
                Schedule V |          1        0.01        0.76
                No control |      1,093       10.93       11.69
              Undetermined |         42        0.42       12.11
                         . |      8,789       87.89      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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