Talk:Instant-runoff voting: Difference between revisions
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(→Does anyone call it IRV any more?: - I'm not inclined to go against the consensus over at English Wikipedia (see w:Instant-runoff voting)) |
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:: My point is that AFAICT, none of the English-speaking nations that actually use IRV call it IRV. (update) Australia, NZ, Papua call it Preferential Voting. US & Canada call it RCV. UK calls it Alternative Vote. Ireland & India call it STV. So it can't possibly be correct to say it's "the term which everybody uses". - [[User:Frankie1969|Frankie1969]] ([[User talk:Frankie1969|talk]]) 13:21, 28 September 2021 (UTC) |
:: My point is that AFAICT, none of the English-speaking nations that actually use IRV call it IRV. (update) Australia, NZ, Papua call it Preferential Voting. US & Canada call it RCV. UK calls it Alternative Vote. Ireland & India call it STV. So it can't possibly be correct to say it's "the term which everybody uses". - [[User:Frankie1969|Frankie1969]] ([[User talk:Frankie1969|talk]]) 13:21, 28 September 2021 (UTC) |
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::: It appears to be called "instant-runoff voting" on English Wikipedia (see [[w:Instant-runoff voting]]). I'm not inclined to go against the consensus over there. -- [[User:RobLa|RobLa]] ([[User talk:RobLa|talk]]) 20:56, 28 September 2021 (UTC) |
::: It appears to be called "instant-runoff voting" on English Wikipedia (see [[w:Instant-runoff voting]]). I'm not inclined to go against the consensus over there. -- [[User:RobLa|RobLa]] ([[User talk:RobLa|talk]]) 20:56, 28 September 2021 (UTC) |
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== Fixing the shortcomings of IRV == |
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I would like to fix the shortcomings of IRV. For discussion, I offer an eleven step instant runoff process to do that. Some of the examples on this website are reproduced here to illustrate how an IRV process can do better. |
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Compromise: regarding the Memphis example. |
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IRV elects Knoxville, some compromises are suggested to avoid electing Knoxville. |
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Nashville will be elected when the 42 Memphis>Nashville>Chattanooga>Knoxville voters |
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flip their votes to Nashville>Memphis>Chattanooga>Knoxville. Alternatively it is |
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suggested that the 26 Nashville>Chattanooga>Knoxville>Memphis voters flip their votes |
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to Chattanooga>Nashville>Knoxville>Memphis to elect Chattanooga, again avoiding the |
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election of Knoxville. |
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I have Nashville elected in step 8. No need for anyone to compromise. |
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IRV can fail to pick a good compromise. |
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38 A>C>B |
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38 B>C>A |
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11 C>A>B |
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13 C>B>A |
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IRV elects B. I would elect C in step 8. |
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IRV fails to count the ballots in a way most favorable to the voters. |
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26 A>B |
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25 C>B |
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49 D |
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IRV elects D. I see a three way tie, and I will elect one of A, B or D in step 11. |
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IRV is vulnerable to center-squeeze (“the three candidate” example from center-squeeze). |
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1031 A>B>C |
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415 B>A>C |
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446 B>C>A |
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1108 C>B>A |
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IRV elects A. I would elect B in step 8. IRV needs to be less vulnerable to |
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center-squeeze, the center candidate, B in this example, should win. |
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IRV is vulnerable to favorite betrayal: from the favorite betrayal criterion. |
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10 A>B>C>D |
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6 B>A>C>D |
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5 C>B>A>D |
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20 D>A>C>B |
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IRV elects B. I would elect A in step 8. IRV needs to be less vulnerable to favorite |
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betrayal, voters should not need to change their votes. |
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IRV gives supporters of A an opportunity to win if they betray their favorite. |
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2 C>A>B>D |
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8 A>B>C>D |
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6 B>A>C>D |
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5 C>B>A>D |
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20 D>A>C>B |
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IRV elects A. I would still elect A, this time in step 5. |
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Supporters of A should not have to be this sneaky. |
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Please consider using an eleven step instant runoff process to make IRV more fair. |
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I have used Google Sheets to create a demonstrator. I'm old and not an expert in anything. But I'm pretty sure it works. I will be very embarrassed if I've made typos in the formulae and the results don't make sense. Point it out and I'll fix it. Here's a link to my spreadsheet: |
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https://docs.google.com/spreadsheets/d/1D1Aeoy3Y17gcnCyVx6AlGEIYneDidRpqn5a-lClC66I/edit#gid=664199959 |
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--[[User:RalphInOttawa|RalphInOttawa]] ([[User talk:RalphInOttawa|talk]]) 05:00, 2 December 2023 (UTC) |