Frequencies for first 10,000 rows of contsub2 variable in nhamcsed2004 dataset :

 controlled substance code |
         for medication #2 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        338        3.38        3.38
              schedule iii |        297        2.97        6.35
               schedule iv |        200        2.00        8.35
                schedule v |         11        0.11        8.46
                no control |      4,148       41.48       49.94
              undetermined |        100        1.00       50.94
                         . |      4,906       49.06      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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