Frequencies for first 10,000 rows of contsub11 variable in nhamcsed2013 dataset :

      Controlled substance |
status code for medication |
                       #11 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          7        0.07        0.07
              Schedule III |          2        0.02        0.09
               Schedule IV |          2        0.02        0.11
                No control |         72        0.72        0.83
                         . |      9,917       99.17      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016