Pairwise counting: Difference between revisions
Reintroduced Condorcet loser as e.g. STAR passes it and uses pairwise counting. Summable contingent vote would also use it.
(SLEM methods usually satisfy Condorcet-loser too.) |
(Reintroduced Condorcet loser as e.g. STAR passes it and uses pairwise counting. Summable contingent vote would also use it.) |
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'''Pairwise counting''' is the process of considering a set of items, comparing one pair of items at a time, and for each pair counting the comparison results. In the context of voting theory, it involves comparing pairs of candidates or winner sets (usually using majority rule) to determine the winner and loser of the [[Pairwise matchup|pairwise matchup]]. This is done by looking at voters' (usually [[Ranked ballot|ranked]] or [[Rated ballot|rated]]) ballots to count, for each pair of candidates, which one they indicated a preference for, if they did. The [[pairwise preference]] article discusses how pairwise comparison information can be used.
Most, but not all, election methods that meet the [[Condorcet criterion]] or the [[Condorcet loser criterion]] use pairwise counting.<ref group="nb">
== Procedure ==
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