A report on Condorcet method
Election method that elects the candidate who wins a majority of the vote in every head-to-head election against each of the other candidates, that is, a candidate preferred by more voters than any others, whenever there is such a candidate.
- Condorcet method33 related topics with Alpha
Electoral system
11 linksElectoral systems map.svg or sole (unicameral) house of national legislatures, .Majoritarian system, single-winner districts
Electoral systems map.svg or sole (unicameral) house of national legislatures, .Majoritarian system, single-winner districts
Ranked systems include Bucklin voting, the various Condorcet methods (Copeland's, Dodgson's, Kemeny-Young, Maximal lotteries, Minimax, Nanson's, Ranked pairs, Schulze), the Coombs' method and positional voting.
Instant-runoff voting
12 linksType of ranked preferential voting method.
Type of ranked preferential voting method.
James Green-Armytage tested four ranked-choice methods, and found the alternative vote to be the second-most-resistant to tactical voting, though it was beaten by a class of AV-Condorcet hybrids, and did not resist strategic withdrawal by candidates well.
Ranked voting
10 linksThe term ranked voting (also known as preferential voting or ranked choice voting) refers to any voting system in which voters rank their candidates (or options) in a sequence of first or second (or third, etc.) on their respective ballots.
The term ranked voting (also known as preferential voting or ranked choice voting) refers to any voting system in which voters rank their candidates (or options) in a sequence of first or second (or third, etc.) on their respective ballots.
Methods with this property are known as Condorcet methods.
Schulze method
8 linksElectoral system developed in 1997 by Markus Schulze that selects a single winner using votes that express preferences.
Electoral system developed in 1997 by Markus Schulze that selects a single winner using votes that express preferences.
The Schulze method is a Condorcet method, which means that if there is a candidate who is preferred by a majority over every other candidate in pairwise comparisons, then this candidate will be the winner when the Schulze method is applied.
Smith set
6 linksSmallest non-empty set of candidates in a particular election such that each member defeats every candidate outside the set in a pairwise election.
Smallest non-empty set of candidates in a particular election such that each member defeats every candidate outside the set in a pairwise election.
The Condorcet winner, if one exists, is the sole member of the Smith set. If weak Condorcet winners exist then they are in the Smith set.
Mutual majority criterion
6 linksCriterion used to compare voting systems.
Criterion used to compare voting systems.
All Smith-efficient Condorcet methods pass the mutual majority criterion.
Borda count
4 linksFamily of positional voting rules which gives each candidate, for each ballot, a number of points corresponding to the number of candidates ranked lower.
Family of positional voting rules which gives each candidate, for each ballot, a number of points corresponding to the number of candidates ranked lower.
In this respect, it is the same as elections under systems such as instant-runoff voting, the single transferable vote or Condorcet methods.
Independence of irrelevant alternatives
6 linksAxiom of decision theory and various social sciences.
Axiom of decision theory and various social sciences.
In collective decision making contexts, the axiom takes a more refined form, and is mathematically intimately tied with Condorcet methods, the Gibbard–Satterthwaite theorem, and the Arrow Impossibility theorem.
First-past-the-post voting
4 linksIn a first-past-the-post electoral system (FPTP or FPP; formally called single-member plurality voting (SMP) when used in single-member districts, or (informally) choose-one voting in contrast to ranked voting or score voting ), voters cast their vote for a candidate of their choice, and the candidate who receives the most votes wins (even if the top candidate gets less than 50%, which can happen when there are more than two popular candidates).
In a first-past-the-post electoral system (FPTP or FPP; formally called single-member plurality voting (SMP) when used in single-member districts, or (informally) choose-one voting in contrast to ranked voting or score voting ), voters cast their vote for a candidate of their choice, and the candidate who receives the most votes wins (even if the top candidate gets less than 50%, which can happen when there are more than two popular candidates).
Examples include preferential voting systems, such as instant runoff voting, as well as the two-round system of runoffs and less tested methods such as approval voting and Condorcet methods.
Tactical voting
5 linksUndesirable outcome.
Undesirable outcome.
Burying: A voter insincerely ranks an alternative lower in the hopes of defeating it. For example, in the Borda count or in a Condorcet method, a voter may insincerely rank a perceived strong alternative last in order to help their preferred alternative win.