Frequencies for first 10,000 rows of contsub7 variable in namcs2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |          9        0.09        0.09
              schedule iii |         18        0.18        0.27
               schedule iv |         49        0.49        0.76
                schedule v |          5        0.05        0.81
                no control |      1,044       10.44       11.25
              undetermined |         11        0.11       11.36
        multiple schedules |          3        0.03       11.39
                         . |      8,861       88.61      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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