Frequencies for childrenonlycontractmaxchildrenr variable in busrules2016 dataset :

   Children |
       Only |
   Contract |
        Max |
   Children |
       Rule |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,509       17.15       17.15
  3 or more |      7,290       82.85      100.00
------------+-----------------------------------
      Total |      8,799      100.00

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