Frequencies for first 10,000 rows of contsub1 variable in nhamcsed2011 dataset :

      Controlled substance |
status code for medication |
                        #1 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        739        7.39        7.39
              Schedule III |        340        3.40       10.79
               Schedule IV |        210        2.10       12.89
                Schedule V |          7        0.07       12.96
                No control |      6,445       64.45       77.41
              Undetermined |         56        0.56       77.97
        Multiple schedules |         73        0.73       78.70
                         . |      2,130       21.30      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016