Frequencies for first 10,000 rows of contsub7 variable in nhamcsed2011 dataset :

      Controlled substance |
status code for medication |
                        #7 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         32        0.32        0.32
              Schedule III |         11        0.11        0.43
               Schedule IV |         17        0.17        0.60
                Schedule V |          2        0.02        0.62
                No control |        271        2.71        3.33
              Undetermined |          2        0.02        3.35
        Multiple schedules |          1        0.01        3.36
                         . |      9,664       96.64      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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