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Voting theory

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minority group
group of people by practices, race, religion, ethnicity, or other characteristics who are fewer in numbers than the main groups of those classifications
electoral unit
territorial division made or used for elections
majority
A majority is more than half of a total; however, the term is commonly used with other meanings, as explained in the "Related terms" section below.
election threshold
vote share required for representation
supermajority
A supermajority is a requirement for a proposal to gain a specified level of support which is greater than the threshold of one-half used for a simple majority, the latter sometimes expressed as a vote". Supermajority rules in a democracy can help to prevent a majority from eroding fundamental rights of a minority, but can also hamper efforts to respond to problems and encourage corrupt compromises at times when action is taken. Changes to constitutions, especially those with entrenched clauses, commonly require supermajority support in a legislature. In consensus democracy, the supermajority
plurality
candidate or proposition polling more votes than any other, but not necessarily with a majority
Arrow's impossibility theorem
Result that no ranked-choice system is spoilerproof
voting paradox (Condorcet)
Marquis de Condorcet's observation regarding times when voters' collective preferences are cyclic, even when voters' individual preferences are not
election abstention
thumb|Comparative results of 2011 Canadian federal election with or without abstention
tactical voting
strategically voting for other than one's true preference, based on knowledge of the voting system
largest remainder method
method of allocating seats proportionally for representative assemblies with party list voting systems
electoral list
group of candidates for an election which voters can choose as a unit
Duverger's law
principle in political science
liquid democracy
form of delegative democracy
political apathy
indifference towards, or rejection of, politics
majority rule
decision rule that selects alternatives which have a majority
median voter theorem
theorem in political science
spoilt vote
ballot that is invalid and is thus not included in the final vote count
Foot voting
expressing preferences through actions
wasted vote
set of ballots that do not help elect a candidate, including those cast for a losing candidate, and those cast for a winning candidate in excess of that needed to win
voting behavior
form of political behavior
Bertrand's ballot theorem
theorem that, in an election where candidate A receives 𝑝 votes and candidate B receives 𝑞 votes (𝑝>𝑞), the probability that A will be strictly ahead of B throughout the count is (𝑝−𝑞)/(𝑝+𝑞)
Condorcet's jury theorem
political science theorem
double majority
type of voting procedure
effective number of parties
Concept in political party systems
Smart Voting
tactical voting strategy by the Russia opposition
Gibbard–Satterthwaite theorem
theorem that deterministic ordinal electoral systems that choose a single winner are either dictatorial, binary choice, or susceptible to tactical voting
Shapley–Shubik power index
voting power index based on pivotal probability
Banzhaf power index
power index defined by the probability of changing an outcome of a vote where voting rights are not necessarily equally divided among the voters or shareholders
Gallagher index
measure of electoral disproportionality
Downs' paradox of voting
the paradox that larger the electorate, the less each vote matters
proxy voting
form of voting whereby some may delegate their voting power to others to vote in their absence
May's theorem
Social Choice theory on voting
Social Choice and Individual Values
essay by Kenneth Arrow
curia
electoral system
Low information voter
Poorly informed people who vote in elections
Mierscheid law
hypothesis based on a spurious relationship
independent voter
voter not aligned with any political party
Pedersen index
measure of electoral volatility in political party systems
political endorsement
publicly declaring support for a candidate
redistribution
process by which electoral districts are added, removed, or otherwise changed