Frequencies for first 10,000 rows of contsub5 variable in nhamcsed2004 dataset :

 controlled substance code |
         for medication #5 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         77        0.77        0.77
              schedule iii |         50        0.50        1.27
               schedule iv |         40        0.40        1.67
                schedule v |          1        0.01        1.68
                no control |        884        8.84       10.52
              undetermined |         32        0.32       10.84
                         . |      8,916       89.16      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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