Frequencies for childrenonlycontractmaxchildrenr variable in busrules2015 dataset :

   Children |
       Only |
   Contract |
        Max |
   Children |
       Rule |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,483       24.60       24.60
  3 or more |      7,612       75.40      100.00
------------+-----------------------------------
      Total |     10,095      100.00

by Jean Roth , jroth@nber.org , 9 Dec 2017