Frequencies for first 10,000 rows of contsub11 variable in nhamcsed2012 dataset :

      Controlled substance |
status code for medication |
                       #11 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          3        0.03        0.03
               Schedule IV |          1        0.01        0.04
                No control |         38        0.38        0.42
        Multiple schedules |          1        0.01        0.43
                         . |      9,957       99.57      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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