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Condorcet method
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==Evaluation by criteria== Scholars of electoral systems often compare them using mathematically defined [[Comparison of electoral systems|voting system criteria]]. The criteria which Condorcet methods satisfy vary from one Condorcet method to another. However, the Condorcet criterion implies the [[Majority favorite criterion|majority criterion]], and thus is incompatible with [[independence of irrelevant alternatives]] (though it implies a weaker analogous form of the criterion: when there is a Condorcet winner, losing candidates can drop out of the election without changing the result),<ref>{{cite arXiv |eprint=1804.02973 |page=351 |quote=The Condorcet criterion for single-winner elections (section 4.7) is important because, when there is a Condorcet winner b ∈ A, then it is still a Condorcet winner when alternatives a1,...,an ∈ A \ {b} are removed. So an alternative b ∈ A doesn’t owe his property of being a Condorcet winner to the presence of some other alternatives. Therefore, when we declare a Condorcet winner b ∈ A elected whenever a Condorcet winner exists, we know that no other alternatives a1,...,an ∈ A \ {b} have changed the result of the election without being elected.|last1=Schulze |first1=Markus |title=The Schulze Method of Voting |year=2018 |class=cs.GT }}</ref> [[later-no-harm]], the [[participation criterion]], and the [[consistency criterion]]. {| class="wikitable" style="text-align:center" |- style="font-size:90%;line-height:1;" ! {{diagonal split header|<br />Condorcet<br />method|Voting system<br />criterion}} !! [[Monotonicity criterion|Monotonic]] !! [[Condorcet loser criterion|Condorcet<br />loser]] !! [[Independence of clones criterion|Clone<br />independence]] !! [[Reversal symmetry|Reversal<br />symmetry]] !! [[Polynomial time|Polynomial<br />time]] !! [[Resolvability criterion|Resolvable]] !! [[Independence of irrelevant alternatives#Local independence|Local<br />independence<br />of irrelevant<br />alternatives]] |- ! [[Schulze method|Schulze]] | {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{no}} |- ! [[Ranked Pairs]] | {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} |- ! [[Minimax Condorcet|Minimax]] | {{yes}} || {{no}} || {{no}} || {{no}} || {{yes}} || {{yes}} || {{no}} |- ! [[Nanson's method|Nanson]] | {{no}} || {{yes}} || {{no}} || {{yes}} || {{yes}} || {{partial|Unknown}} || {{partial|Unknown}} |- ! [[Kemeny–Young method|Kemeny–Young]] | {{yes}} || {{yes}} || {{no}} || {{yes}} || {{no}} || {{yes}} || {{yes}} |- ! [[Dodgson's method|Dodgson]] | {{no}} || {{no}} || {{no}} || {{no}} || {{no}} || {{partial|Unknown}} || {{partial|Unknown}} |- ! [[Copeland's method|Copeland]] | {{yes}} || {{yes}} || {{no}} || {{yes}} || {{yes}} || {{no}} || {{no}} |}
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