Frequencies for first 10,000 rows of contsub8 variable in nhamcsopd2006 dataset :

       for rx8, controlled |
     substance status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |         19        0.19        0.19
              Schedule III |         10        0.10        0.29
               Schedule IV |         21        0.21        0.50
                Schedule V |          2        0.02        0.52
                No control |        518        5.18        5.70
              Undetermined |         10        0.10        5.80
                         . |      9,420       94.20      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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