Frequencies for first 10,000 rows of contsub3 variable in nhamcsed2003 dataset :

 controlled substance code |
         for medication #3 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        176        1.76        1.76
              schedule iii |        168        1.68        3.44
               schedule iv |        100        1.00        4.44
                schedule v |         17        0.17        4.61
                no control |      2,255       22.55       27.16
              undetermined |         76        0.76       27.92
                         . |      7,208       72.08      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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