Frequencies for first 10,000 rows of contsub5 variable in namcs2010 dataset :

    controlled status code |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               schedule ii |         27        0.27        0.27
              schedule iii |         36        0.36        0.63
               schedule iv |         76        0.76        1.39
                schedule v |         13        0.13        1.52
                no control |      1,896       18.96       20.48
              undetermined |         24        0.24       20.72
        multiple schedules |          3        0.03       20.75
                         . |      7,925       79.25      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

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