Frequencies for childrenonlycontractmaxchildrenr variable in busrules2018 dataset :

   Children |
       Only |
   Contract |
        Max |
   Children |
       Rule |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,098       25.58       25.58
  3 or more |      3,195       74.42      100.00
------------+-----------------------------------
      Total |      4,293      100.00

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