Frequencies for first 10,000 rows of contsub3 variable in namcs2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         51        0.51        0.51
              schedule iii |         74        0.74        1.25
               schedule iv |        127        1.27        2.52
                schedule v |         13        0.13        2.65
                no control |      3,570       35.70       38.35
              undetermined |         60        0.60       38.95
        multiple schedules |          5        0.05       39.00
                         . |      6,100       61.00      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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