Frequencies for first 10,000 rows of contsub5 variable in nhamcsed2006 dataset :

       for rx5, controlled |
     substance status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         56        0.56        0.56
              schedule iii |         27        0.27        0.83
               schedule iv |         18        0.18        1.01
                schedule v |          3        0.03        1.04
                no control |        414        4.14        5.18
              undetermined |         10        0.10        5.28
                         . |      9,472       94.72      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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