Frequencies for first 10,000 rows of contsub4 variable in namcs2012 dataset :

Controlled status code for |
              medication 4 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         48        0.48        0.48
              Schedule III |         43        0.43        0.91
               Schedule IV |        104        1.04        1.95
                Schedule V |         10        0.10        2.05
                No control |      2,236       22.36       24.41
              Undetermined |         79        0.79       25.20
        Multiple schedules |         10        0.10       25.30
                         . |      7,470       74.70      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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