Frequencies for first 10,000 rows of contsub1 variable in namcs2009 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |        278        2.78        2.78
              schedule iii |        174        1.74        4.52
               schedule iv |        221        2.21        6.73
                schedule v |         33        0.33        7.06
                no control |      7,068       70.68       77.74
              undetermined |        159        1.59       79.33
        multiple schedules |         21        0.21       79.54
                         . |      2,046       20.46      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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