Frequencies for first 10,000 rows of contsub8 variable in nhamcsopd2008 dataset :

       for rx8, controlled |
     substance status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         30        0.30        0.30
              schedule iii |         13        0.13        0.43
               schedule iv |         21        0.21        0.64
                schedule v |          3        0.03        0.67
                no control |        844        8.44        9.11
              undetermined |         10        0.10        9.21
                         8 |          1        0.01        9.22
                         . |      9,078       90.78      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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