Contents 1 Usage 2 Types 3 Example 4 Properties 5 Strategy 6 Advocacy 7 See also 8 Notes 9 External links


Usage[edit] A crude form of range voting[6][7] was apparently used in some elections in Ancient Sparta, by measuring how loudly the crowd shouted for different candidates.[8] This has a modern-day analog of using clapometers in some television shows and the judging processes of some athletic competitions. The Republic of Venice elected the Doge in a multi-round system, with the round that actually named the Doge being a three point range election (For, Neutral, Against).[9] This process was used continually, with only minor changes, for over 500 years, until the republic was conquered by Napoleon. A modern governmental example is the selection process for the United Nations Secretary-General, which also has a three point scale ("Encourage," "Discourage," and "No Opinion"). Non-governmental uses of range voting are common, such as in Likert scale customer satisfaction surveys (such as for a restaurant), automated telephone surveys (where one is asked to press or say a number to indicate their level of satisfaction or likelihood), and any mechanism that includes "giving some number of stars" as a rating (such as rating movies on IMDb, products at Amazon, apps in the iOS or Google Play stores, etc.) Range voting is common for things where there is no single winner: for instance on the Web, sites allow users to rate items such as movies (Internet Movie Database), comments, recipes, and many other things. Sports such as gymnastics rate competitors on a numeric scale, although the fact that judges' ratings are public makes it less likely for them to engage in blatant tactical voting. Range voting is used by the Green Party of Utah to elect officers.[10] A multi-winner variant, re-weighted range voting, is used to select the nominees for the Academy Award for Best Visual Effects.[11] The traditional "highest grade point average" method of selecting a Valedictorian can be seen as a type of range election, wherein instructors "vote" on the student "candidates," with grades as their range-based votes.


Types[edit] Range voting uses a ratings ballot; that is, each voter rates each candidate with a number within a specified range, such as 0 to 9[12] or 1 to 5. In the simplest system, all candidates must be rated. The scores for each candidate are then summed, and the candidate with the highest sum is the winner. (This is simpler for voters than cumulative voting, where they are not permitted to provide scores for more than some number of candidates.) Some systems allow voters to explicitly abstain from rating certain candidates, as opposed to implicitly giving the lowest number of points to unrated candidates. In this case, a candidate's score would be the average rating from voters who did rate this candidate. However, some method must then be used to exclude candidates who received too few votes, to provide a meaningful average.[13][14] In some competitions subject to judges' scores, a truncated mean is used to remove extreme scores. For example, range voting with truncated means is used in figure skating competitions to avoid the results of the third skater affecting the relative positions of two skaters who have already finished their performances (the independence of irrelevant alternatives), using truncation to mitigate biases of some judges who have ulterior motives to score some competitors too high or low. Another method of counting ratings ballots is to find the median score of each candidate, and elect the candidate with the highest median score. This method is also referred to as Majority Judgment.[15][16] It could have the effect of reducing the incentive to exaggerate. A potential disadvantage is that multiway exact ties for winner may become common, although a method exists in Majority Judgment to break such ties.[15] In conventional range voting, these ties would be extremely rare. Another consequence of using medians is that adding an "all-zero ballot" can alter the election winner, which is arguably a disadvantage. Score Runoff Voting uses a standard Score Voting ballot. The counting method adds an extra step to yield the preference winner between the top two scoring candidates overall. Another proposed variant is score runoff voting. Under this system, each voter may assign a score, from 0 to the maximum score, to any number of candidates. Of the two highest-scoring candidates, the winner is the one more voters assigned a higher score.[17] The concept was first proposed publicly in October 2014 by Center for Election Science co-founder Clay Shentrup.[18] The runoff step was introduced in order to correct for strategic distortion in ordinary score voting,[19] such as Bullet voting and tactical maximization.[20] Range voting in which only two different votes may be submitted (0 and 1, for example) is equivalent to approval voting. As with approval voting, range voters must weigh the adverse impact on their favorite candidate of ranking other candidates highly.


Example[edit] v t e Imagine that Tennessee is having an election on the location of its capital. The population of Tennessee is concentrated around its four major cities, which are spread throughout the state. For this example, suppose that the entire electorate lives in these four cities and that everyone wants to live as near to the capital as possible. The candidates for the capital are: Memphis, the state's largest city, with 42% of the voters, but located far from the other cities Nashville, with 26% of the voters, near the center of the state Knoxville, with 17% of the voters Chattanooga, with 15% of the voters The preferences of the voters would be divided like this: 42% of voters (close to Memphis) 26% of voters (close to Nashville) 15% of voters (close to Chattanooga) 17% of voters (close to Knoxville) Memphis Nashville Chattanooga Knoxville Nashville Chattanooga Knoxville Memphis Chattanooga Knoxville Nashville Memphis Knoxville Chattanooga Nashville Memphis Suppose that 100 voters each decided to grant from 0 to 10 points to each city such that their most liked choice got 10 points, and least liked choice got 0 points, with the intermediate choices getting an amount proportional to their relative distance. Voter from/ City Choice Memphis Nashville Chattanooga Knoxville Total Memphis 420 (42 × 10) 0 (26 × 0) 0 (15 × 0) 0 (17 × 0) 420 Nashville 168 (42 × 4) 260 (26 × 10) 90 (15 × 6) 85 (17 × 5) 603 Chattanooga 84 (42 × 2) 104 (26 × 4) 150 (15 × 10) 119 (17 × 7) 457 Knoxville 0 (42 × 0) 52 (26 × 2) 90 (15 × 6) 170 (17 × 10) 312 Nashville, the capital in real life, likewise wins in the example. However, if voters from Knoxville and Chattanooga were to rate Nashville as 0 (so 2 for Memphis) and both sets of voters were to rate Chattanooga as 10, the winner would be Chattanooga over Nashville by 508 to 428 (and 484 for Memphis). This would be a better outcome for the voters in those cities than what they would get if they were to reflect their true preferences, and is considered to be an instance of tactical voting. Such tactical voting would be less effective if the ballots were counted using median scores (the principle behind Majority Judgment). Tactical voting is inevitable however, it is unlikely that only voters looking for one outcome would be voting tactically. Many Memphis voters would likely realise that they didn't have a chance and rank Nashville higher. For comparison, note that traditional first-past-the-post would elect Memphis, even though most citizens consider it the worst choice, because 42% is larger than any other single city. Instant-runoff voting would elect the 2nd-worst choice (Knoxville), because the central candidates would be eliminated early. In Approval voting, with each voter selecting their top two cities, Nashville would win because of the significant boost from Memphis residents. A two-round system would have a runoff between Memphis and Nashville where Nashville would win.


Properties[edit] Range voting allows voters to express preferences of varying strengths. Range voting satisfies the monotonicity criterion, i.e. raising your vote's score for a candidate can never hurt their chances of winning, and lowering it can never help their chances. Also, range voting satisfies the participation criterion, i.e. casting a sincere vote can never result in a worse election winner (from your point of view) than if you had simply abstained from voting. Range voting is independent of clones in the sense that if there is a set of candidates such that every voter gives the same rating to every candidate in this set, then the probability that the winner is in this set is independent of how many candidates are in the set. In summary, range voting satisfies the monotonicity criterion, the participation criterion, the consistency criterion, independence of irrelevant alternatives, resolvability criterion, and reversal symmetry, provided voters do not have perfect information (see below; if they do have perfect information, it becomes a Condorcet method, which means it fails participation, consistency, and independence of irrelevant alternatives). It is immune to cloning, except for the obvious specific case in which a candidate with clones ties, instead of achieving a unique win. It does not satisfy either the Condorcet criterion (i.e., is not a Condorcet method) or the Condorcet loser criterion, although with all-strategic voters and perfect information the Condorcet winner is a Nash equilibrium.[21] It does not satisfy the later-no-harm criterion, meaning that giving a positive rating to a less preferred candidate can cause a more preferred candidate to lose. It does not satisfy the majority criterion, but it satisfies a weakened form of it: a majority can force their choice to win, although they might not exercise that capability. To address this point, some proponents of range voting argue for the inclusion of an extra instant-runoff round in which a majority preference is established between the two top-rated candidates.[22] As it satisfies the criteria of a deterministic voting method, with non-imposition, non-dictatorship, monotonicity, and independence of irrelevant alternatives, it may appear that it violates Arrow's impossibility theorem. The reason that range voting is not regarded as a counter-example to Arrow's theorem is that it is a cardinal voting method, while the "universality" criterion of Arrow's theorem effectively restricts that result to ordinal voting methods.[23]


Strategy[edit] See also: Tactical voting § Range_voting In most cases, ideal range voting strategy for well-informed voters is identical to ideal approval voting strategy, and a voter would want to give their least and most favorite candidates a minimum and a maximum score, respectively. If one candidate's backers engaged in this tactic and other candidates' backers cast sincere rankings for the full range of candidates, then the tactical voters would have a significant advantage over the rest of the electorate. When the population is large and there are two obvious and distinct front-runners, tactical voters seeking to maximize their influence on the result would give a maximum rating to their preferred candidate, and a minimum rating to the other front-runner; these voters would then give minimum and maximum scores to all other candidates so as to maximize expected utility. If all voters voted in this manner, Range voting is simply a scaled version of Plurality voting. However, there are examples in which voting maximum and minimum scores for all candidates is not optimal.[24] Exit poll experiments have shown that voters tend to vote more sincerely for candidates they perceive have no chance of winning.[25] Thus range voting may yield higher support for third party and independent candidates, unless those candidates become viable, than other common voting methods, creating what has been called the "nursery effect".[26] Tactical voters are faced with the initial tactic as to how highly to score their second choice candidate. The voter may want to retain expression of a high preference of their first choice over their second. But that does not allow the same voter to express a high preference of their second choice over any others. Range voting advocates argue that range voting methods (including approval voting) give no reason to ever dishonestly rank a less-preferred candidate over a more-preferred one in 3-candidate elections.[27] However, detractors respond that it provides motivation to rank a less-preferred and more-preferred candidate equally or near-equally (i.e., both 0-1 or both 98-99). This could lead to undemocratic results if different segments of the population used strategy at significantly different rates. (Note that traditional first-past-the-post voting forces all candidates except one to be ranked equally, so that all voters are compressing their preferences equally.) Addressing these criticisms, the Equal Vote Coalition, a voting reform advocacy group, proposes a variant of range voting with an extra second round featuring the two top rated candidates in which the candidate with the majority of preference wins. It is claimed that the existence of a second round would discourage approval-style strategic ballots and exaggeration of ratings.[28]


Advocacy[edit] Range voting is advocated online by the election reform sites RangeVote.com, The Center for Election Science, and the Center for Range Voting. The Equal Vote Coalition advocates a variant method with an extra second round to address some of the criticisms of traditional range voting. Guy Ottewell, who helped develop the method of approval voting, now endorses range voting.[29] No elected official in the United States is known to endorse range voting.


See also[edit] List of democracy and elections-related topics Consensus decision-making Decision making Democracy Relative Utilitarianism Hot or Not — a real-world example Majority judgment — similar voting method, based on medians instead of averages


Notes[edit] ^ "Center for Range Voting - front page". RangeVoting.org. Retrieved 2016-12-11. score voting (also known as "range voting").  ^ "Score Voting". The Center for Election Science. 2015-05-21. Retrieved 2016-12-11.  ^ "Social Choice and Beyond - Range Voting". socialchoiceandbeyond.com. Retrieved 2016-12-10. with the winner being the one with the largest point total. Or, alternatively, the average may be computed and the one with the highest average wins  ^ "Score Voting". The Center for Election Science. 2015-05-21. Retrieved 2016-12-10. Simplified forms of score voting automatically give skipped candidates the lowest possible score for the ballot they were skipped. Other forms have those ballots not affect the candidate’s rating at all. Those forms not affecting the candidates rating frequently make use of quotas. Quotas demand a minimum proportion of voters rate that candidate in some way before that candidate is eligible to win.  ^ a b Baujard, Antoinette; Igersheim, Herrade; Lebon, Isabelle; Gavrel, Frédéric; Laslier, Jean-François (2014-06-01). "Who's favored by evaluative voting? An experiment conducted during the 2012 French presidential election". Electoral Studies. 34: 131–145. doi:10.1016/j.electstud.2013.11.003. voting rules in which the voter freely grades each candidate on a pre-defined numerical scale. .. also called utilitarian voting  ^ James S. Fishkin: The Voice of the People: Public Opinion & Democracy, Yale University Press 1995 ^ "Ancient Sparta used range voting... sort of".  ^ Stille, Alexander (2001-06-02). "Adding Up the Costs of Cyberdemocracy". New York Times. Retrieved 2009-10-03.  ^ http://www.rangevoting.org/VenHist.html ^ "Utah Green Party Hosts Dr. Stein; Elects New Officers". Independent Political Report. 2017-06-27. Retrieved 2017-09-14. Using the following Range Voting System, the Green Party of Utah elected a new slate of officers  ^ "89TH ANNUAL ACADEMY AWARDS OF MERIT" (PDF). 2016. RULE TWENTY-TWO SPECIAL RULES FOR THE VISUAL EFFECTS AWARD. Five productions shall be selected using reweighted range voting to become the nominations for final voting for the Visual Effects award.  ^ "Rating Scale Research". RangeVoting.org. Retrieved 2016-12-11. The evidence surveyed here currently suggests that the "best" scale for human voters should have 10 levels  ^ "Better "Soft Quorum" Rule". RangeVoting.org. Retrieved 2016-12-11.  ^ "How Not To Sort By Average Rating". evanmiller.org. Retrieved 2016-12-11. Average rating works fine if you always have a ton of ratings, but suppose item 1 has 2 positive ratings and 0 negative ratings. ...  ^ a b Michel Balinski and Rida Laraki. "A theory of measuring, electing, and ranking — PNAS". Pnas.org. Retrieved 2009-08-03.  ^ "VotingMJL.dvi" (PDF). Retrieved 2009-08-03.  ^ "Equal Vote Coalition". Equal Vote Coalition. Retrieved 2017-04-05.  ^ "Google Groups". groups.google.com. Retrieved 2017-04-05.  ^ "Score Runoff Voting: The New Voting Method that Could Save Our Democratic Process". IVN.us. 2016-12-08. Retrieved 2017-04-05.  ^ "Strategic SRV? - Equal Vote Coalition". Equal Vote Coalition. Retrieved 2017-04-05.  ^ Laslier, J.-F. (2006) "Strategic approval voting in a large electorate," IDEP Working Papers No. 405 (Marseille, France: Institut D'Economie Publique) ^ "Score Runoff Voting". Equal Vote Coalition. Retrieved 2016-12-04.  ^ Arrow, Kenneth (August 1950). "A Difficulty in the Concept of Social Welfare". The Journal of Political Economy. 58 (4): 328–346. doi:10.1086/256963.  ^ "Examples in which best Range Voting strategy is not "approval style" voting". The center for range voting.  ^ "Honesty and Strategy in real-world voters". The center for range voting.  ^ "The "Nursery Effect" (Executive summary)". The center for range voting.  ^ "Completion of Gibbard-Satterthwaite impossibility theorem; range voting and voter honesty" (PDF). Warren Smith, Temple University.  ^ "Compare Approval". Equal Vote Coalition. Retrieved 2016-12-04.  ^ Ottewell, Guy (April 2004). "The Arithmetic of Voting". Universal Workbench. self published. Retrieved January 8, 2010. 


External links[edit] The Center for Range Voting and its simplified introductory homepage The Center for Election Science includes an article on Score Voting Equal Vote Coalition, which promotes a variant of range voting in the United States RangeVote includes a user-friendly presentation on range voting Range voting discussion list at Yahoo Groups Simulation of various voting models for close elections Article by Brian Olson. Mechanic, Michael; William Poundstone (2007-01-02). "The verdict is in: our voting system is a loser". Mother Jones. The Foundation for National Progress. Retrieved 2008-02-04.  v t e 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 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 quotas Droop quota Hagenbach-Bischoff quota Hare quota Imperiali quota Other Ballot Election threshold First-preference votes Spoilt vote Sortition Portal — Project Retrieved from "https://en.wikipedia.org/w/index.php?title=Range_voting&oldid=826950381" Categories: Electoral systemsSingle-winner electoral systemsCardinal electoral systemsMonotonic electoral systems


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