Frequencies for first 10,000 rows of contsub22 variable in namcs2014 dataset :

 Controlled substance code |
        for medication #22 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |          1        0.01        0.01
              Schedule III |          1        0.01        0.02
               Schedule IV |          1        0.01        0.03
                No control |         40        0.40        0.43
              Undetermined |          2        0.02        0.45
                         . |      9,955       99.55      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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