Frequencies for first 10,000 rows of contsub5 variable in nhamcsopd2006 dataset :

       for rx5, controlled |
     substance status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         31        0.31        0.31
              Schedule III |         24        0.24        0.55
               Schedule IV |         63        0.63        1.18
                Schedule V |          1        0.01        1.19
                No control |      1,303       13.03       14.22
              Undetermined |         20        0.20       14.42
                         . |      8,558       85.58      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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