Frequencies for sourcename variable in busrules2017 dataset :

Source Name |      Freq.     Percent        Cum.
------------+-----------------------------------
       HIOS |      3,408       51.48       51.48
        OPM |        187        2.82       54.31
      SERFF |      3,025       45.69      100.00
------------+-----------------------------------
      Total |      6,620      100.00

by Jean Roth , jroth@nber.org , 8 Dec 2017