Frequencies for first 10,000 rows of contsub25 variable in namcs2014 dataset :

 Controlled substance code |
        for medication #25 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
              Schedule III |          1        0.01        0.01
                No control |         18        0.18        0.19
              Undetermined |          1        0.01        0.20
                         . |      9,980       99.80      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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