Frequencies for first 10,000 rows of contsub10 variable in nhamcsed2012 dataset :

      Controlled substance |
status code for medication |
                       #10 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          6        0.06        0.06
              Schedule III |          1        0.01        0.07
               Schedule IV |          6        0.06        0.13
                No control |        111        1.11        1.24
              Undetermined |          2        0.02        1.26
                         . |      9,874       98.74      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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