Frequencies for first 10,000 rows of contsub1 variable in nhamcsed2015 dataset 

      Controlled substance |
status code for medication |
                        #1 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        550        5.50        5.50
              Schedule III |        313        3.13        8.63
               Schedule IV |        193        1.93       10.56
                Schedule V |         12        0.12       10.68
                No control |      6,761       67.61       78.29
              Undetermined |         99        0.99       79.28
        Multiple schedules |         61        0.61       79.89
                         . |      2,011       20.11      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017