Frequencies for first 10,000 rows of contsub25 variable in nhamcsed2014 dataset :

      Controlled substance |
status code for medication |
                       #25 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          1        0.01        0.01
              Schedule III |          1        0.01        0.02
               Schedule IV |          2        0.02        0.04
                No control |          5        0.05        0.09
                         . |      9,991       99.91      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017