Frequencies for first 10,000 rows of contsub1 variable in namcs2014 dataset :

 Controlled substance code |
         for medication #1 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        303        3.03        3.03
              Schedule III |        214        2.14        5.17
               Schedule IV |        217        2.17        7.34
                Schedule V |         21        0.21        7.55
                No control |      6,507       65.07       72.62
              Undetermined |        193        1.93       74.55
        Multiple schedules |         37        0.37       74.92
                         . |      2,508       25.08      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017