Frequencies for first 10,000 rows of contsub5 variable in namcs2006 dataset :

       for rx5, controlled |
     substance status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         19        0.19        0.19
              schedule iii |         26        0.26        0.45
               schedule iv |         60        0.60        1.05
                schedule v |          6        0.06        1.11
                no control |      1,569       15.69       16.80
              undetermined |         32        0.32       17.12
                         . |      8,288       82.88      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016