Frequencies for first 10,000 rows of contsub2 variable in namcs2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         87        0.87        0.87
              schedule iii |        108        1.08        1.95
               schedule iv |        201        2.01        3.96
                schedule v |         26        0.26        4.22
                no control |      4,953       49.53       53.75
              undetermined |         82        0.82       54.57
        multiple schedules |         32        0.32       54.89
                         . |      4,511       45.11      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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