Frequencies for sourcename variable in busrules2018 dataset :

Source Name |      Freq.     Percent        Cum.
------------+-----------------------------------
       HIOS |      2,209       51.46       51.46
        OPM |          3        0.07       51.53
      SERFF |      2,081       48.47      100.00
------------+-----------------------------------
      Total |      4,293      100.00

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