Single transferable vote: Difference between revisions

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The '''Single Transferable Vote''', or '''STV''', is a [[preference voting|preference]] [[voting system]] designed to minimise wasted votes in multi-candidate elections while ensuring that votes are explicitly for candidates rather than party lists.
 
When promoted as a [[proportional representation]] method in multi-party multi-seat elections, it is generally known as '''Proportional Representation through the Single Transferable Vote''' or '''PR-STV'''. When a similar method is applied to single-seat [[elections]] it is sometimes called ''[[instant-runoff voting]]'' or the ''alternative vote'', and has different proportionality implications for a similar ballot. In both systems of voting the ballot choices represent an [[Preferential_voting|ordinal ranking of preferences]], but an "instant runoff" for only one position or measure is a simple calculation.
 
== Voting ==
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==In practice==
Places that use STV for governmental elections include:
* [[Australia]], for the [[Australian Senate|Senate]] [http://www.eca.gov.au/systems/proportional/proportion_rep.htm] and for one or other of the state houses.
* [[Republic of Ireland|Ireland]], for all elections [http://www.rte.ie/news/dailguide/prsystem.html]
* [[Malta]], for all elections [http://www.maltadata.com]
* [[New Zealand]] [http://www.stv.govt.nz], where STV is being used for the first time for district health board and some local authority elections in October 2004
* [[Northern Ireland]], for local, [[Northern Ireland Assembly|Assembly]] and [[European Parliament|European]] elections
* The [[United States]], where the only official governing bodies that use STV to elect representatives are the City Council and School Committee of [[Cambridge, Massachusetts]].
 
STV enjoyed some popularity in the United States in the first half of the 20th Century. The community school boards of the City of [[New York City|New York]] [http://ccrc.wustl.edu/~lorracks/projects/techreport/subsection3_4_4.html] used STV until they were abolished in 2002.
 
The method used for electing the Legislative Assemblies of [[Tasmania]] and the elections in the province of [[Alberta]], [[Canada]] from [[1926]] to [[1955]].
 
[[British Columbia]] will decide in 2005 by referendum whether to adopt STV to replace its current [[First Past the Post]] electoral system, after a recommendation of STV [http://www.citizensassembly.bc.ca/public/news/2004/10/dmaclachlan-3_0410241345-701] by the [[Citizens' Assembly on Electoral Reform (British Columbia)|Citizens' Assembly on Electoral Reform]].
 
Some non-governmental organisations also use STV. For instance, all [[National Union of Students of the United Kingdom]] elections and those of their constituent members are under the system.
 
==Historical assessments==
An early proponent of STV was [[John Stuart Mill]], who praised it in "On Representation." In the "English Constitution" [[Walter Bagehot]] praised the Hare system for allowing everyone, even ideological minorities, to elect an MP, but said that the Hare would create more problems than it solved. "[the Hare system] is inconsistent with the extrinsic independence as well as the inherent moderation of a Parliament - two of the conditions we have seen, are essential to the bare possibility of parliamentary government."
 
==See also==
*[[List of democracy and elections-related topics]]
* [[Table of voting systems by nation]]
* [[Single Non-Transferable Vote]]
* [[preference voting]]
* [[Instant-runoff voting]]
* [[voting systems]]
* [[Hagenbach-Bischoff quota]]
* [[Hare quota]]
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*[http://dmoz.org/Society/Politics/Campaigns_and_Elections/Voting_Systems/Single_Transferable_Vote/ ODP category]
* [http://stv.sourceforge.net/ pSTV--software for computing the single transferable vote]
*[http://www.electionmethods.org/ ElectionMethods.org] on comparisons between different methods
* [http://www.electoral-reform.org.uk Electoral Reform Society]
[[Category:Voting systems]]
* [http://www.prsa.org.au Proportional Representation Society of Australia]
* [http://www.oasis.gov.ie/government_in_ireland/elections/proportional_representation.html?PHPSESSID=fe117d4bb6373eea8e4bf359999978c5 The Single Transferrable Vote procedure in Ireland]
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* [http://fc.antioch.edu/james_green-armytage/voting.htm James Green-Armytage's voting methods page] information about single-winner and multiple-winner voting methods, including several versions of STV
 
* [[votingCategory:Voting systems]]
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