Frequencies for first 10,000 rows of contsub18 variable in nhamcsed2014 dataset :

      Controlled substance |
status code for medication |
                       #18 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          3        0.03        0.03
              Schedule III |          1        0.01        0.04
               Schedule IV |          2        0.02        0.06
                No control |         23        0.23        0.29
              Undetermined |          1        0.01        0.30
                         . |      9,970       99.70      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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