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The single transferable vote (STV) is a voting system designed to achieve proportional representation through ranked voting in multi-seat organizations or constituencies (voting districts).[1] Under STV, an elector (voter) has a single vote that is initially allocated to their most preferred candidate and, as the count proceeds and candidates are either elected or eliminated, is transferred to other candidates according to the voter's stated preferences, in proportion to any surplus or discarded votes. The exact method of reapportioning votes can vary (see Counting methods). The system provides approximately proportional representation, enables votes to be cast for individual candidates rather than for parties, and—compared to first-past-the-post voting—reduces "wasted" votes (votes on sure losers or sure winners) by transferring them to other candidates. STV is the system of choice of groups such as the Proportional Representation Society of Australia
Australia
(which calls it quota-preferential proportional representation),[2] the Electoral Reform Society
Electoral Reform Society
in the United Kingdom[3] and FairVote
FairVote
in the USA (which refers to both STV and instant-runoff voting as ranked-choice voting,[4] although there are other preferential voting methods that use ranked-choice ballots). Its critics contend that some voters find the mechanisms behind STV difficult to understand, but this does not make it more difficult for voters to "rank the list of candidates in order of preference" on an STV ballot paper (see Voting).[5]

Contents

1 Governments with STV 2 Terminology 3 Voting 4 Counting the votes

4.1 Simplest Method: Elimination Transfers Only 4.2 More Refined Method: Setting the Quota 4.3 Finding the winners 4.4 Example

5 Counting methods 6 History and current use 7 Issues

7.1 Degree of proportionality 7.2 Difficulty of implementation 7.3 Role of political parties 7.4 By-elections 7.5 Tactics 7.6 Elector confusion 7.7 Other

8 Analysis of results

8.1 Migration of preferences

9 See also 10 References

10.1 Notes 10.2 Bibliography

11 Further reading 12 External links

Governments with STV[edit] STV has had its widest adoption in the English-speaking world. As of 2018[update], in government elections, STV is used for:

Ireland Parliamentary elections (since 1921) European elections Local government elections

Malta Parliamentary elections (since 1921) European elections Local government elections

United Kingdom Northern Ireland National assembly elections European elections Local government elections

Scotland Local government elections (since May 2007)

India Indirect elections - Rajya Sabha
Rajya Sabha
elections (by state MLAs)

Nepal Indirect elections - Upper house elections (by provinces and local assemblies) since 2018

Pakistan Indirect elections - Senate elections (by members of provincial assemblies, and direct vote by the population of territories)

Australia Federal (country-wide) Senate elections (Since 1948) (in the form of a group voting ticket from 1983 until 2016)

Australian Capital Territory Legislative Assembly elections (Since 1992)

New South Wales Legislative Council elections (since 1978) (in the form of a group voting ticket until 2003) Local government elections

South Australia Legislative Council elections (since 1985) (in the form of a group voting ticket until 2017) Local government elections

Tasmania House of Assembly elections (since 1896) Local government elections

Victoria Legislative Council elections (since 2006) (in the form of a group voting ticket) Local government elections

Western Australia Legislative Council elections (since 1987) (in the form of a group voting ticket)

New Zealand[6]

Regional council elections: Wellington Regional Council Unitary authority elections: Marlborough District Council Territorial authority elections: Palmerston North City Council, Kapiti Coast District
Kapiti Coast District
Council, Porirua City Council, Wellington City Council, Dunedin City Council District health board elections: all 20 boards

United States City elections in Cambridge, Massachusetts At-large municipal board seats[7] in Minneapolis, Minnesota

In British Columbia, Canada, STV was recommended for provincial elections by the BC Citizens' Assembly on Electoral Reform (British Columbia). In a 2005 provincial referendum, it received 57.69% support and passed in 77 of 79 electoral districts. It was not adopted, however, because it fell short of the 60% threshold requirement the Liberal government had set for the referendum to be binding. In a second referendum, on 12 May 2009, STV was defeated 60.91% to 39.09% STV has also been used in several other jurisdictions, particularly in provincial general elections in the cities of Edmonton and Calgary in Alberta. For a more complete list, see History and use of the single transferable vote. Terminology[edit] When STV is used for single-winner elections, it is equivalent to the instant-runoff voting (alternative vote) method.[8] STV used for multi-winner elections is sometimes called "proportional representation through the single transferable vote", or PR-STV. "STV" usually refers to the multi-winner version, as it does in this article. In the United States
United States
it is sometimes called choice voting, preferential voting or preference voting ("preferential voting" can also refer to a broader category, ranked voting systems). Hare-Clark is the name given to PR-STV elections in Tasmania
Tasmania
and the Australian Capital Territory. Voting[edit]

In STV, each voter ranks the list of candidates in order of preference. In the most common ballot design, they place a '1' beside their most preferred candidate, a '2' beside their second most preferred, and so on. The completed ballot paper therefore contains an ordinal list of candidates. In the ballot paper in this image, the preferences of the voter are as follows:

John Citizen Mary Hill Jane Doe

Counting the votes[edit] Simplest Method: Elimination Transfers Only[edit] The most straightforward way to count a ranked ballot vote is simply to sequentially identify the candidate with the least support, eliminate that candidate, and transfer those ballots to the next-named candidate on each ballot. This process is repeated until there are only as many candidates left as seats available. This method was used for a period of time in several local elections in South Australia.[9] In effect, it is identical to instant-runoff voting, which is commonly used in leadership contests, except that the transfer process is terminated when there are still several candidates remaining. More Refined Method: Setting the Quota[edit] In most STV elections, an additional step is taken that ensures that all elected candidates are elected with approximately equal numbers of votes. It can be shown that a candidate requires a minimum number of votes – the quota (or threshold) – to be elected. A number of different quotas can be used; the most common is the Droop quota, given by the floor function formula:

votes needed to win

= floor ⁡

(

valid votes cast

seats to fill

+ 1

)

+ 1

displaystyle mbox votes needed to win =operatorname floor left( rm mbox valid votes cast over rm mbox seats to fill +1 right)+1

The Droop quota is an extension of requiring a 50% + 1 majority in single-winner elections. For example, at most 3 people can have 25% + 1 in 3-winner elections, 9 can have 10% + 1 in 9-winner elections, and so on. If fractional votes can be submitted, then the Droop quota may be modified so that the fraction is not rounded down. Major Frank Britton, of the Election
Election
Ballot
Ballot
Services at the Electoral Reform Society, observed that the final plus one of the Droop quota is never needed. So, the quota for one seat is fifty out of a hundred votes, not fifty-one.[10] Finding the winners[edit] An STV election starts with every voter's first choice, according to the following steps:

A candidate who has reached or exceeded the quota is declared elected. If any such elected candidate has more votes than the quota, the excess votes are transferred to other candidates. Votes that would have gone to the winner go to the next preference. This can be done in several ways (see the section on Counting Methods, below). If no-one new meets the quota, the candidate with the fewest votes is eliminated and those votes are transferred to each voter's next preferred candidate. This process repeats until either a winner is found for every seat or there are as many seats as remaining candidates.

There are variations, such as how to transfer surplus votes from winning candidates and whether to transfer votes to already-elected candidates. When the number of votes transferred from the losing candidate with the fewest votes is too small to change the ordering of remaining candidates, more than one candidate can be eliminated simultaneously. One simplistic formula for how to transfer surplus votes is:

transferred votes given to the next preference

=

(

votes for next preference belonging to the original candidate

total votes for the original candidate

)

surplus votes for original candidate

displaystyle mbox transferred votes given to the next preference =left( mbox votes for next preference belonging to the original candidate over mbox total votes for the original candidate right)* mbox surplus votes for original candidate

however, this can produce fractional votes. See Counting Methods for a discussion of how this is handled. If a candidate is eliminated and their votes are transferred to already victorious candidates, then the new excess votes for the victorious candidate (transferred from the eliminated candidate) will be transferred to the next preference of the victorious candidate, as happened with their initial excess. However, any votes which would transfer from the victorious candidate to one who was already eliminated must be reallocated. See the section on Counting Methods below for details. Because votes cast for losing candidates and excess votes cast for winning candidates are transferred to voters' next choice candidates, STV is said to minimize wasted votes. Example[edit] Suppose a food election is conducted to determine what to serve at a party. There are 5 candidates, 3 of which will be chosen. The candidates are: Oranges, Pears, Chocolate, Strawberries, and Sweets. The 20 guests at the party mark their ballots according to the table below. In this example, a second choice is made by only some of the voters.

# of guests x x x x x x x x x x x x x x x x x x x x

1st preference

2nd preference

First, the quota is calculated. Using the Droop quota, with 20 voters and 3 winners to be found, the number of votes required to be elected is:

Q

Droop

= floor ⁡

(

20

 (votes cast)

3

 (seats to fill)

+ 1

)

+ 1 = 6

 (votes required)

displaystyle Q_ operatorname Droop =operatorname floor left( 20 mbox (votes cast) over 3 mbox (seats to fill) +1 right)+1=6 mbox (votes required)

.

When ballots are counted the election proceeds as follows:

Candidate

Result

Round 1 x x x x x x x x x x x x x x x x x x x x Chocolate is declared elected, since Chocolate has more votes than the quota (with six surplus votes, to be precise).

Round 2 x x x x x x x x x x x x x x x x x x x x Chocolate's surplus votes transfer to Strawberry and Sweets in proportion to the Chocolate voters' second choice preferences, using the formula:

(

votes for second preference

total votes for Chocolate

)

surplus votes

displaystyle left( mbox votes for second preference over mbox total votes for Chocolate right)* mbox surplus votes

In this case, 8 of the 12 voters for Chocolate had the second preference of Strawberries, so (8/12)•6 = 4 of Chocolate's votes would transfer to Strawberries; meanwhile 4 of the 12 voters for Chocolate had Sweets as their second preference, so (4/12)•6 = 2 of Chocolate's votes will transfer to Sweets. Thus, Strawberries has 1 first-preference votes and 4 new votes, for an updated total of 1+4 = 5 votes; likewise, Sweets now has 1 + 2 = 3 votes; no other tallies change. Even with the transfer of this surplus no candidate has reached the quota. Therefore, Pear, which now has the fewest votes (after the update), is eliminated.

Round 3 x x x x x x

x x x x x x x x x x x x x x Pear's votes are transferred in proportion to the second-preference options of voters of Pear, i.e. only Oranges in this case, which gives Oranges 2 more votes. Oranges now totals 4 (original) + 2 (new) = 6 votes, reaching the quota; so, Oranges is elected. Orange meets the quota exactly, and therefore has no surplus to transfer.

Round 4 x x x x x x

x x x x x x x x x x x x x x Neither of the remaining candidates meets the quota. Strawberry has more votes, so Sweets are eliminated. Sweets' votes would be transferred proportionately, but only two preferences were selected, so Chocolate-then-Sweets votes cannot be reallocated; moreover, no-one who voted for Sweets originally gave a second preference. Therefore, all votes for Sweets disappear. Strawberries is the only remaining candidate, so it wins the final seat (despite not satisfying the quota).

Result: The winners are Chocolate, Oranges and Strawberries. Counting methods[edit] Main article: Counting single transferable votes See also: Comparison of the Hare and Droop quotas STV systems primarily differ in how they transfer votes and in the size of the quota. For this reason some have suggested that STV can be considered a family of voting systems rather than a single system. The Droop quota is the most commonly used quota. This ensures majority rule (except in rare cases) while maintaining the condition that no more candidates can reach a quota than there are seats to be filled. The Hare quota, which was used in the original proposals by Thomas Hare,[11] ensures greater proportionality, at the expense of having to count more votes and not guaranteeing majority rule. The easiest methods of transferring surpluses involve an element of randomness; partially random systems are used in the Republic of Ireland (except Senate elections) and in Malta, among other places. The Gregory method (also known as Newland-Britain or Senatorial rules) eliminates randomness by allowing for the transfer of fractions of votes. Gregory is in use in Northern Ireland, the Republic of Ireland (Senate elections) and in Australia. Both Gregory and earlier methods have the problem that in some circumstances they do not treat all votes equally. For this reason Meek's method, Warren's method and the Wright system
Wright system
have been invented.[12] While easier methods can usually be counted by hand, except in a very small election Meek and Warren require counting to be conducted by computer.[citation needed] The Wright system
Wright system
is a refinement of the Australian Senate
Australian Senate
system replacing the process of distribution and segmentation of preferences by a reiterative counting process where the count is reset and restarted on every exclusion. Meek is used in local body elections in New Zealand. Meek in 1969[13] was the first to realize that computers make it possible to count votes in way that is conceptually simpler and closer to the original concept of STV. One advantage of Meek's method is that the quota is adjusted at each stage of counting when the number of votes decreases because some become non-transferable. Meek also considered a variant on his system which allows for equal preferences to be expressed.[14] This has subsequently (since 1998) been used by the John Muir Trust
John Muir Trust
for electing its trustees.[15] History and current use[edit] Main article: History and use of the single transferable vote

Carl Andræ

The concept of transferable voting was first proposed by Thomas Wright Hill in 1819. The system remained unused in public elections until 1855, when Carl Andræ
Carl Andræ
proposed a transferable vote system for elections in Denmark, and his system was used in 1856 to elect the Rigsraad and from 1866 it was also adapted for indirect elections to the second chamber, the Landsting, until 1915.[16]

Thomas Hare

Although he was not the first to propose transferable votes, the English barrister Thomas Hare is generally credited with the conception of STV, and he may have independently developed the idea in 1857. Hare's view was that STV should be a means of "making the exercise of the suffrage a step in the elevation of the individual character, whether it be found in the majority or the minority." In Hare's original system, he further proposed that electors should have the opportunity of discovering which candidate their vote had ultimately counted for, to improve their personal connection with voting.[11] It should be noted that at the time of Hare's original proposal the UK did not use the secret ballot, so not only could the voter determine the ultimate role of their vote in the election, the elected MPs would have been able to determine who had voted for them. As Hare envisaged that the whole House of Commons be elected "at large" this would have replaced geographical constituencies with what Hare called "constituencies of interest" - those people who had actually voted for each MP. In modern elections, held by secret ballot, a voter can discover how their vote was distributed by viewing detailed election results. This is particularly easy to do using Meek's method, where only the final weightings of each candidate need to be published. The elected member is, however, unable to verify who their supporters are. The noted political essayist John Stuart Mill
John Stuart Mill
was a friend of Hare's and an early proponent of STV, praising it at length in his essay Considerations on Representative Government, in which he writes: "Of all modes in which a national representation can possibly be constituted, this one affords the best security for the intellectual qualifications desirable in the representatives. At present... the only persons who can get elected are those who possess local influence, or make their way by lavish expenditure...."[17] His contemporary, Walter Bagehot, also praised the Hare system for allowing everyone to elect an MP, even ideological minorities, but also argued that the Hare system 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."[18] Advocacy of STV spread through the British Empire, leading it to be sometimes known as British Proportional Representation. In 1896, Andrew Inglis Clark
Andrew Inglis Clark
was successful in persuading the Tasmanian House of Assembly to be the first parliament in the world elected by what became known as the Hare-Clark electoral system, named after himself and Thomas Hare. H. G. Wells
H. G. Wells
was a strong advocate, calling it "Proportional Representation".[19] The HG Wells formula for scientific voting, repeated, over many years, in his PR writings, to avoid misunderstanding, is Proportional Representation by the Single Transferable Vote in large constituencies.[20] STV in large constituencies permits an approach to the Hare-Mill-Wells ideal of mirror representation. The UK National Health Service used to elect, First Past The Post, all white male General Practitioners. In 1979, STV proportionally represented women, immigrants and specialists, to the General Medical Council.[21]

Australian Senate
Australian Senate
ballot paper used in Victoria for 2016

In 1948, single transferable vote proportional representation on a state-by-state basis became the method for electing Senators to the Australian Senate. This change has led to the rise of a number of minor parties such as the Democratic Labor Party, Australian Democrats and Australian Greens
Australian Greens
who have taken advantage of this system to achieve parliamentary representation and the balance of power. From the 1984 election, group ticket voting was introduced in order to reduce a high rate of informal voting but in 2016, group tickets were abolished to avoid undue influence of preference deals amongst parties that were seen as distorting election results[22] and a form of optional preferential voting was introduced. STV was also adopted in the first half of the 20th century to elect several city councils in the United States. More than twenty cities used STV, including Cleveland, Cincinnati
Cincinnati
and New York City. As of January 2010, it is used to elect the city council and school committee in Cambridge, Massachusetts
Cambridge, Massachusetts
and the park board in Minneapolis, Minnesota. STV has also been adopted for student government elections at several American universities, including Carnegie Mellon,[23][24] Harvard, MIT, Oberlin, Reed, UC Berkeley, UC Davis, Vassar, UCLA
UCLA
and Whitman. Legislation (HR 3057), was introduced in Congress in June 2017 that would establish STV for US House elections starting in 2022.[25] Issues[edit] Main article: Issues affecting the Single Transferable Vote Degree of proportionality[edit] The degree of proportionality of STV election results depends directly on the district magnitude (i.e. the number of seats in each district). While Ireland originally had a median district magnitude of five (ranging from three to nine) in 1923, successive governments lowered this. Systematically lowering the number of representatives from a given district directly benefits larger parties at the expense of smaller ones. Supposing that the Droop quota is used: in a nine-seat district, the quota or threshold is 10% (plus one vote); in a three-seat district, it would be 25% (plus one vote). A parliamentary committee in 2010 discussed the "increasing trend towards the creation of three-seat constituencies in Ireland" and recommended not less than four-seaters, except where the geographic size of such a constituency would be disproportionately large.[26] STV provides proportionality by transferring votes to minimize waste, and therefore also minimizes the number of unrepresented or disenfranchised voters. Difficulty of implementation[edit] A frequent concern about STV is its complexity compared with plurality voting methods. Before the advent of computers, this complexity would have made ballot-counting more difficult than some other voting methods. The algorithm is complicated. In large elections with many candidates, a computer may be required. (This is because after several rounds of counting, there may be many different categories of previously transferred votes, each with a different permutation of early preferences and thus each with a different carried-forward weighting, all of which have to be kept track of.) Role of political parties[edit] STV differs from other proportional representation systems in that candidates of one party can be elected on transfers from voters for other parties. Hence, STV may reduce the role of political parties in the electoral process and corresponding partisanship in the resulting government. A district only needs to have four members to be proportional for the major parties,[where?] but may under-represent smaller parties, even though they may well be more likely to be elected under STV than under first past the post. Also, while small parties seen as reasonable second preferences by others (such as the Green Party in Ireland) more easily get elected, parties seen as more extreme by others (such as Sinn Féin in Ireland) find it harder to attract second preferences and therefore find it harder to win seats.[citation needed] By-elections[edit] As STV is a multi-member system, filling vacancies between elections can be problematic, and a variety of methods have been devised:

The countback method is used in the Australian Capital Territory, Tasmania, Victoria, Malta, and Cambridge, Massachusetts. Casual vacancies could be filled by re-examining the ballot papers data from the previous election. Another option is to have a head official or remaining members of the elected body appoint a new member to fulfill the vacancy. A third way to fill a vacancy is to hold a single-winner by-election (effectively instant-runoff); this allows each party to choose a new candidate and all voters to participate. Yet another option would be to allow the party of the vacant member to nominate a successor, possibly subject to the approval of the voting population or the rest of the government. Another possibility is to have the candidates themselves create an ordered list of successors before leaving their seat. In the European Parliament, a departing Republic of Ireland
Republic of Ireland
or Northern Ireland
Northern Ireland
member is replaced with the top eligible name from a replacement list submitted by the candidate at the time of the original election. This method was also used in the Northern Ireland
Northern Ireland
Assembly, changed in 2009 to allow political parties to nominate new MLAs in the event of a vacancy. Independent MLAs may still draw up a list of potential replacements.[27] For its 2009 European elections, Malta
Malta
set a one-off policy to elect the candidate eliminated last for filling the prospective vacancy for the extra seat to arise from the Lisbon Treaty.

Tactics[edit] See also: Tactical voting § Single transferrable vote If there are not enough candidates to represent one of the priorities the electorate vote for (such as a party), all of them may be elected in the early stages, with votes being transferred to candidates with other views. On the other hand, putting up too many candidates might result in first preference votes being spread too thinly among them, and consequently several potential winners with broad second-preference appeal may be eliminated before others are elected and their second-preference votes distributed. In practice, the majority of voters express preference for candidates from the same party in order,[citation needed] which minimizes the impact of this potential effect of STV. The outcome of voting under STV is proportional within a single election to the collective preference of voters, assuming voters have ranked their real preferences and vote along strict party lines (assuming parties and no individual independents participate in the election). However, due to other voting mechanisms usually used in conjunction with STV, such as a district or constituency system, an election using STV may not guarantee proportionality across all districts put together. A number of methods of tactical or strategic voting exist that can be used in STV elections, but much less so than with First Past the Post. (In STV elections, most constituencies will be marginal, at least with regard to the allocation of a final seat.) Elector confusion[edit] STV systems vary, both in ballot design and in whether or not voters are obliged to provide a full list of preferences. In jurisdictions such as Malta, Republic of Ireland
Republic of Ireland
and Northern Ireland, voters may rank as many or as few candidates as they wish. Consequently, voters sometimes, for example, rank only the candidates of a single party, or of their most preferred parties. A minority of voters, especially if they do not fully understand the system, may even "bullet vote", only expressing a first preference, or indicate a first preference for multiple candidates, especially when both STV and plurality are being used in concurrent elections.[28] Allowing voters to rank only as many candidates as they wish grants them greater freedom, but can also lead to some voters ranking so few candidates that their vote eventually becomes "exhausted"–that is, at a certain point during the count, it can no longer be transferred and therefore loses an opportunity to influence the result. The method can be confusing, and may cause some people to vote incorrectly with respect to their actual preferences. The ballots can also be long; having multiple pages also increases the chances of people missing the later opportunities to continue voting.[clarification needed] Other[edit] Some opponents[who?] argue that larger, multi-seat districts would require more campaign funds to reach the voters. Proponents argue that STV can lower campaign costs because like-minded candidates can share some expenses. In addition, unlike in at-large plurality elections, candidates do not have to secure the support of at least 50% of voters, allowing candidates to focus campaign spending primarily on supportive voters. Analysis of results[edit] Academic analysis of voting systems such as STV generally centers on the voting system criteria that they pass. No preference voting system satisfies all the criteria in Arrow's impossibility theorem: in particular, STV fails to achieve independence of irrelevant alternatives (like most other vote-based ordering systems) and monotonicity. Migration of preferences[edit] The relative performance of political parties in STV (single transferable vote) systems is analysed in a different fashion from that used in other electoral schemes. For example, seeing which candidates are declared elected on first preference votes alone can be shown as follows:

Scottish local elections, 2012[29]

Party Total elected Elected on 1st prefs

Total % % (2007)

Conservative 115 46 40.0 40.6

Labour 394 199 50.5 37.4

Liberal Democrat 71 20 28.2 21.7

SNP 425 185 43.5 56.5

Scottish Green 14 1 7.1 –

Independent 200 79 39.5 31.6

Other 4 2 50.0 14.3

Totals 1,223 532 43.5 39.7

The data can also be analysed to find the proportion of voters who express only a single preference,[30] or those who express a minimum number of preferences,[31] in order to assess party strength. Where parties nominate multiple candidates in an electoral district, analysis can also be done to assess their relative strength.[32] Other useful information can be found by analysing terminal transfers—i.e., when the votes of a candidate are transferred and no other candidate from that party remains in the count[31]—especially with respect to the first instance in which that occurs:

Average first terminal transfer rates (2012)[33]

Transferred from % non-transferable % transferred to

Con Lab LD SNP Ind/Other

Conservative 33.6 – 8.0 32.4 8.3 17.6

Labour 47.8 5.8 – 13.2 16.5 16.7

Liberal Democrat 23.1 21.8 20.4 – 15.5 19.3

SNP 44.2 6.0 18.1 14.1 – 17.8

Scottish Green 20.4 5.1 19.2 19.9 18.3 17.0

Another effect of STV is that candidates who did well on first preference votes may not be elected, and those who did poorly on first preferences can be elected, because of differences in second and later preferences. This can also be analysed:

Candidates not in a winning position on 1st preference who secured election, by party (2012)[34]

Political party Elected though not in top 3 or 4 Not elected though in top 3 or 4 Net gain/loss

2012 2007

Conservative 1 16 −15 −24

Labour 21 8 +13 −17

Liberal Democrat 4 3 +1 +29

SNP 19 29 −10 –

Scottish Green 1 1 – +1

Independent 22 9 +13 +8

Other – 2 −2 +3

See also[edit]

Political science portal

Tally (voting) None of the above Approval Voting Single non-transferable vote Table of voting systems by country Voting matters, a journal concerned with the technical aspects of STV

References[edit] Notes[edit]

^ "Single Transferable Vote". Electoral Reform Society.  ^ "Proportional Representation and its Importance". Proportional Representation Society of Australia.  ^ "Our mission". Electoral Reform Society. Archived from the original on 12 February 2013.  ^ "Ranked Choice Voting". FairVote.  ^ Margetts 2003, p. 68. ^ "Single Transferable Vote". Department of Internal Affairs. 2013. Retrieved 1 April 2016.  ^ "What offices are elected using Ranked-Choice Voting?". What is Ranked-Choice Voting?. City of Minneapolis
Minneapolis
Elections & Voter Services. Retrieved 2017-12-31.  ^ http://www.fairvote.org/how_rcv_works Note that when used to elect a multiple candidates to office, ranked choice voting (RCV or IRV) is a form of fair representation voting, and it may be called single transferable vote or STV. ^ "Newsletter of Proportional Representation Society of Australia QUOTA NOTES September 1986 QN43". www.prsa.org.au.  ^ Newland 1984. ^ a b Lambert & Lakeman 1955, p. 245. ^ Hill, Wichmann & Woodall 1987. ^ Meek 1994a. ^ Meek 1994b. ^ "Examples of STV elections". hw.ac.uk.  ^ AndrĂŚs metode Gyldendal – Den Store Danske ^ Mill 1861, p. 144. ^ Bagehot 1894,  p. 158. ^ Wells 1918, pp. 121–129. ^ HG Wells 1916: The Elements of Reconstruction. HG Wells 1918: In The Fourth Year. ^ Electoral Reform Society, 1979 audit, which records the gratitude of the British medical profession for introducing STV. ^ Anderson, Stephanie (25 April 2016). "Senate Voting Changes Explained in Australian Electoral Commission Advertisements". ABC News. Retrieved 30 August 2017.  ^ "Elect@CMU About single transferable voting". Carnegie Mellon University.  ^ Gund, Devin. "CMU Fair Ranked Voting".  ^ Donald, Beyer, (14 July 2017). "H.R.3057 - 115th Congress (2017-2018): Fair Representation Act". www.congress.gov.  ^ Ireland 2010, p. 177. ^ "Change to the System for Filling Vacancies in the NI Assembly" (Press release). Northern Ireland
Northern Ireland
Office. 10 February 2009. Archived from the original on 7 March 2012. Retrieved 5 October 2011.  ^ Ombler 2006. ^ Curtice 2012, p. 22. ^ Curtice 2012, p. 13. ^ a b Curtice 2012, p. 14. ^ Curtice 2012, pp. 17–18. ^ Curtice 2012, pp. 15–16. ^ Curtice 2012, p. 23.

Bibliography[edit]

Bagehot, Walter (1894) [1867].  The English Constitution (7th ed.). London: Kegan Paul, Trench, Trübner & Co.. Wikisource.  Curtice, John (2012). "2012 Scottish Local Government Elections" (PDF). London: Electoral Reform Society. Archived from the original (PDF) on 15 September 2015. Retrieved 30 August 2017.  Hill, I. D.; Wichmann, B. A.; Woodall, D. R. (1987). "Algorithm 123: Single Transferable Vote by Meek's Method". The Computer Journal. 30 (3): 277–281. doi:10.1093/comjnl/30.3.277 . ISSN 1460-2067.  Ireland. Oireachtas. Joint Committee on the Constitution (2010). "Article 16 of the Constitution: Review of the Electoral System for the Election
Election
of Members to Dáil Éireann" (PDF). Dublin: Stationery Office. ISBN 978-1-4064-2501-7. Archived from the original (PDF) on 18 January 2012. Retrieved 20 November 2010.  Lambert, Enid; Lakeman, James D. (1955). Voting in Democracies. London: Faber and Faber.  Margetts, Helen (2003). "Electoral Reform". In Fisher, Justin; Denver, David; Benyon, John. Central Debates in British Politics. Abingdon, England: Routledge (published 2014). pp. 64–82. ISBN 978-0-582-43727-2.  Meek, B. L. (1994a). "A New Approach to the Single Transferable Vote. Paper I: Equality of Treatment of Voters and a Feedback Mechanism for Vote Counting". Voting matters. London: McDougall Trust (1): 1–7. ISSN 1745-6231. Retrieved 30 August 2017.   ———  (1994b). "A New Approach to the Single Transferable Vote. Paper II: The Problem of Non-transferable Votes". Voting matters. London: McDougall Trust (1): 7–11. ISSN 1745-6231. Retrieved 30 August 2017.  Mill, John Stuart (1861). Considerations on Representative Government. London: Parker, Son, and Bourn. Retrieved 20 June 2014 – via Google Books.  Newland, Robert A. (1984). "The STV Quota". Representation: Journal of the Electoral Reform Society. London: McDougall Trust. 24 (95). doi:10.1080/00344898408459347. ISSN 0034-4893.  Ombler, Franz (2006). "Booklet Position Effects, and Two New statistics to Gauge Voter Understanding of the Need to Rank Candidates in Preferential Elections" (PDF). Voting matters. London: McDougall Trust (21): 12–21. ISSN 1745-6231. Retrieved 30 August 2017.  Wells, H. G. (1918). In the Fourth Year: Anticipation of a World Peace. London: Chatto & Windus. Retrieved 6 May 2016 – via Internet Archive.  Bach, Stanley (2003). Platypus and Parliament: The Australian Senate in Theory and Practice. Department of the Senate. ISBN 0-642-71291-3. 

Further reading[edit]

Bartholdi, John J., III; Orlin, James B. (1991). "Single Transferable Vote Resists Strategic Voting" (PDF). Social Choice and Welfare. Springer-Verlag. 8 (4): 341–354. doi:10.1007/BF00183045. ISSN 0176-1714. JSTOR 41105995. Retrieved 30 August 2017.  Geller, Chris (2002). "Single Transferable Vote with Borda Elimination: A New Vote-Counting System" (PDF). Deakin University, Faculty of Business and Law.   ———  (2004). "Single Transferable Vote with Borda Elimination: Proportional Representation, Moderation, Quasi-chaos and Stability". Electoral Studies. Oxford: Elsevier. 24 (2). doi:10.1016/j.electstud.2004.06.004. ISSN 1873-6890.  O'Neill, Jeffrey C. (2004). "Tie-Breaking with the Single Transferable Vote" (PDF). Voting matters. London: McDougall Trust (18): 14–17. ISSN 1745-6231. Retrieved 30 August 2017.  Sawer, Marian & Miskin, Sarah (1999). Papers on Parliament No. 34 Representation and Institutional Change: 50 Years of Proportional Representation in the Senate. Department of the Senate. ISBN 0-642-71061-9. 

External links[edit]

ACE Project A concise STV analogy – from Accurate Democracy Accurate Democracy lists a dozen programs for computing the single transferable vote.

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Electoral systems

Part of the politics and election series

Single-winner voting system

Approval voting Borda count Bucklin voting Contingent vote Coombs' method Copeland's method Dodgson's method Exhaustive ballot First-past-the-post voting Instant-runoff voting Kemeny–Young method Majority judgment Simple majoritarianism Minimax Condorcet Nanson's method Plurality Positional voting system Range voting Ranked pairs Schulze method Two-round system

Proportional representation

Mixed-member Party-list Single transferable vote Schulze STV CPO-STV Highest averages method

Sainte-Laguë D'Hondt

Largest remainder method Alternative vote Plus Closed list Open list Overhang seat Underhang seat

Semi-proportional representation

Parallel voting Single non-transferable vote Cumulative voting Limited voting Proportional approval voting Sequential proportional approval voting Satisfaction approval voting

Usage

Table of voting systems by country

Voting system
Voting system
criteria

Comparison Condorcet criterion Condorcet loser criterion Consistency criterion Independence of clones Independence of irrelevant alternatives Independence of Smith-dominated alternatives Later-no-harm criterion Majority criterion Majority loser criterion Monotonicity criterion Mutual majority criterion Pareto efficiency Participation criterion Plurality criterion Resolvability criterion Reversal symmetry Smith criterion

Voting system
Voting system
quotas

Droop quota Hagenbach-Bischoff quota Hare quota Imperiali quota

Other

Ballot Election
Election
threshold First-preference votes Spoilt vote Sortition

Portal
Portal
— Project

v t e

Parliament of Australia

Components

Queen (represented by the Governor-General) Senate House of Representatives

Parliamentary officers

Senate

President of the Senate Clerk Leader of the Government in the Senate Manager of Government Business Leader of the Opposition in the Senate Manager of Opposition Business Whips (list)

House of Representatives

Speaker of the Australian House of Representatives Clerk Prime Minister Leader of the House Leader of the Opposition Manager of Opposition Business Whips (list)

Members

Served in both houses Represented multiple states 30+ years Father of the Parliament

Senate

Current (previous) Appointees Women Father of the Senate

House of Representatives

Current (previous) Women Father of the House

Parliaments

Chronology of Australian federal parliaments 44th 45th Parliament of Australia

Procedure

Speech from the throne Joint meetings Question time Matter of public importance Readings of bills Queen's Consent Royal assent List of Acts of the Parliament of Australia Committees: Senate  House of Reps

Elections

Last Next List Double dissolution Senate: Single transferable vote House of Representatives: Instant-runoff voting Two-party-preferred vote Divisions By-elections Caretaker government Court of Disputed Returns

Locations

Parliament House, Melbourne Old Parliament House Parliame

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