Frequencies for childrenonlycontractmaxchildrenr variable in busrules2017 dataset :

   Children |
       Only |
   Contract |
        Max |
   Children |
       Rule |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,155       17.45       17.45
  3 or more |      5,465       82.55      100.00
------------+-----------------------------------
      Total |      6,620      100.00

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