Frequencies for first 10,000 rows of contsub26 variable in namcs2014 dataset :

 Controlled substance code |
        for medication #26 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule IV |          1        0.01        0.01
                No control |         17        0.17        0.18
                         . |      9,982       99.82      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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