Frequencies for first 10,000 rows of contsub5 variable in nhamcsed2012 dataset :

      Controlled substance |
 status code medication #5 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         86        0.86        0.86
              Schedule III |         41        0.41        1.27
               Schedule IV |         27        0.27        1.54
                No control |        884        8.84       10.38
              Undetermined |          5        0.05       10.43
        Multiple schedules |          7        0.07       10.50
                         . |      8,950       89.50      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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