Frequencies for first 10,000 rows of contsub2 variable in namcs2008 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         81        0.81        0.81
              schedule iii |        131        1.31        2.12
               schedule iv |        230        2.30        4.42
                schedule v |         27        0.27        4.69
                no control |      5,081       50.81       55.50
              undetermined |         81        0.81       56.31
        multiple schedules |         23        0.23       56.54
                         . |      4,346       43.46      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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