Frequencies for first 10,000 rows of contsub8 variable in nhamcsed2003 dataset :

 controlled substance code |
         for medication #8 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         14        0.14        0.14
              schedule iii |          6        0.06        0.20
               schedule iv |         14        0.14        0.34
                schedule v |          1        0.01        0.35
                no control |        183        1.83        2.18
              undetermined |          5        0.05        2.23
                         . |      9,777       97.77      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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