Frequencies for first 10,000 rows of contsub11 variable in nhamcsed2014 dataset :

      Controlled substance |
status code for medication |
                       #11 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          8        0.08        0.08
              Schedule III |          1        0.01        0.09
               Schedule IV |          1        0.01        0.10
                No control |        138        1.38        1.48
              Undetermined |          1        0.01        1.49
                         . |      9,851       98.51      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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