Frequencies for first 10,000 rows of contsub1 variable in namcs2008 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        177        1.77        1.77
              schedule iii |        134        1.34        3.11
               schedule iv |        239        2.39        5.50
                schedule v |         27        0.27        5.77
                no control |      7,396       73.96       79.73
              undetermined |        118        1.18       80.91
        multiple schedules |         31        0.31       81.22
                         . |      1,878       18.78      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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