Ranked Pairs: Difference between revisions
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'''Ranked Pairs''' (RP) or '''Tideman''' (named after [[Nicolaus Tideman]]) is a [[voting |
'''Ranked Pairs''' (RP) or '''Tideman''' (named after [[Nicolaus Tideman]]) is a [[voting systems]] that selects a single winner using votes that express preferences. RP can also be used to create a sorted list of winners. RP passes the [[Condorcet Criterion]], and is by definition a '''[[Condorcet method]]'''. RP has many variations such as the [[Maximize Affirmed Majorities]] (MAM) and [[Maximum Majority Voting]] (MMV) voting methods. |
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If there is a candidate who is preferred over the other candidates, |
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when compared in turn with each of the others, RP guarantees that that candidate will win. |
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Because of this property, RP is (by definition) a '''[[Condorcet method]]'''. |
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Note that this is different from some other preference voting systems such as [[Borda count|Borda]] and |
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[[Instant-runoff voting]], which do not make this guarantee. |
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RP has many variations such as the [[Maximize Affirmed Majorities]] (MAM) and [[Maximum Majority Voting]] (MMV) voting methods. |
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Also check out other [[Condorcet method]]s. |
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== Procedure == |
== Procedure == |
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Therefore, A is the winner. |
Therefore, A is the winner. |
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=== Summary === |
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In the example election, the winner is Nashville. |
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This would be true for any [[Condorcet method]]. |
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Using the [[first-past-the-post]] system and some other systems, Memphis would have won the election by having the most people, even though Nashville won every simulated pairwise election outright. Using [[Instant-runoff voting]] in this example would result in Knoxville winning, even though more people preferred Nashville over Knoxville. |
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== External Resources == |
== External Resources == |
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* [http://groups.yahoo.com/group/election-methods-list/ A mailing list containing technical discussions about election methods] |
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* [http://electionmethods.org/ electionmethods.org] |
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* [http://condorcet.org/rp Ranked Pairs] |
* [http://condorcet.org/rp Ranked Pairs] |
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* [http://accurate-democracy.com/ Accurate Democracy] |
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* [http://www.alumni.caltech.edu/~seppley The Maximize Affirmed Majorities voting procedure (MAM)] |
* [http://www.alumni.caltech.edu/~seppley The Maximize Affirmed Majorities voting procedure (MAM)] |
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* [http://radicalcentrism.org/majority_voting.html Maximum Majority Voting] |
* [http://radicalcentrism.org/majority_voting.html Maximum Majority Voting] |