Coombs' method

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Coombs' method (or the Coombs rule)[1] is a ranked voting system created by Clyde Coombs used for single-winner elections. Similarly to instant-runoff voting, it uses candidate elimination and redistribution of votes cast for that candidate until one candidate has a majority of votes.

Example[edit | edit source]

Coombs' method frequently selects the Condorcet winner. However, this does not always happen. For example:


This example, placed in Rob LeGrand's voting calculator, shows that Coombs arrives at a different result than Condorcet. The example is pulled from a Felsenthal and Tideman paper.[2]

Links[edit | edit source]

Footnotes[edit | edit source]

  1. Grofman, Bernard, and Scott L. Feld (2004) "If you like the alternative vote (a.k.a. the instant runoff), then you ought to know about the Coombs rule," Electoral Studies 23:641-59.
  2. Felsenthal, Dan; Tideman, Nicolaus (2013). "Varieties of failure of monotonicity and participation under five voting methods" (PDF). Theory and Decision. 75 (1): 59–77.
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