Frequencies for first 10,000 rows of contsub7 variable in namcs2006 dataset :

       for rx7, controlled |
     substance status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         12        0.12        0.12
              schedule iii |         19        0.19        0.31
               schedule iv |         43        0.43        0.74
                schedule v |          1        0.01        0.75
                no control |        798        7.98        8.73
              undetermined |         17        0.17        8.90
                         . |      9,110       91.10      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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