Frequencies for first 10,000 rows of contsub10 variable in nhamcsed2013 dataset :

      Controlled substance |
status code for medication |
                       #10 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          8        0.08        0.08
              Schedule III |          3        0.03        0.11
               Schedule IV |          8        0.08        0.19
                No control |        107        1.07        1.26
              Undetermined |          1        0.01        1.27
                         . |      9,873       98.73      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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