Frequencies for sourcename variable in busrules2014 dataset :

Source Name |      Freq.     Percent        Cum.
------------+-----------------------------------
       HIOS |      1,208       57.44       57.44
        OPM |         32        1.52       58.96
      SERFF |        863       41.04      100.00
------------+-----------------------------------
      Total |      2,103      100.00

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