Frequencies for first 10,000 rows of contsub18 variable in namcs2014 dataset :

 Controlled substance code |
        for medication #18 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          2        0.02        0.02
               Schedule IV |          5        0.05        0.07
                No control |        114        1.14        1.21
              Undetermined |          3        0.03        1.24
                         . |      9,876       98.76      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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