Frequencies for first 10,000 rows of contsub8 variable in nhamcsopd2004 dataset :

 controlled substance code |
         for medication #8 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         22        0.22        0.22
              schedule iii |          6        0.06        0.28
               schedule iv |         29        0.29        0.57
                schedule v |          1        0.01        0.58
                no control |        494        4.94        5.52
              undetermined |         15        0.15        5.67
                         . |      9,433       94.33      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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