Frequencies for first 10,000 rows of contsub28 variable in namcs2014 dataset :

 Controlled substance code |
        for medication #28 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
                No control |         11        0.11        0.11
              Undetermined |          1        0.01        0.12
                         . |      9,988       99.88      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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