Frequencies for sourcename variable in busrules2016 dataset :

Source Name |      Freq.     Percent        Cum.
------------+-----------------------------------
       HIOS |      5,358       60.89       60.89
        OPM |        209        2.38       63.27
      SERFF |      3,232       36.73      100.00
------------+-----------------------------------
      Total |      8,799      100.00

by Jean Roth , jroth@nber.org , 6 Oct 2016