Frequencies for first 10,000 rows of contsub13 variable in nhamcsed2014 dataset :

      Controlled substance |
status code for medication |
                       #13 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          8        0.08        0.08
               Schedule IV |          3        0.03        0.11
                Schedule V |          1        0.01        0.12
                No control |         79        0.79        0.91
              Undetermined |          1        0.01        0.92
                         . |      9,908       99.08      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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