Frequencies for first 10,000 rows of contsub5 variable in nhamcsed2003 dataset :

 controlled substance code |
         for medication #5 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         46        0.46        0.46
              schedule iii |         28        0.28        0.74
               schedule iv |         30        0.30        1.04
                schedule v |          1        0.01        1.05
                no control |        739        7.39        8.44
              undetermined |         40        0.40        8.84
                         . |      9,116       91.16      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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