Frequencies for first 10,000 rows of contsub10 variable in nhamcsed2014 dataset :

      Controlled substance |
status code for medication |
                       #10 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          9        0.09        0.09
               Schedule IV |          6        0.06        0.15
                No control |        171        1.71        1.86
              Undetermined |          3        0.03        1.89
                         . |      9,811       98.11      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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