Talk:Instant-runoff voting

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Elimination in each round is based on the redistributed vote, not the first preference

The statement in the first paragraph "in each following round, the candidate with the fewest first-preferences (among the remaining candidates) is eliminated" is not correct, at least in terms of how we do it in Australia. The elimination is based on the fewest votes in the latest round of counting after redistribution. The first preference vote only matters for the first round of counting.

It is not that uncommon that the candidate with the second highest first preference vote is eliminated before the third ranked candidate where there are three strong candidates contesting a seat. The outcome of a ballot in some electorates is often decided by who ends up running third and this is not known after the first preference count, but only after the fourth and lower candidates have been eliminated after several rounds of counting. Often the candidate running second on first preferences slips back into third place and is eliminated, but preferences from this candidate now decide the outcome. 121.200.5.244 (talk) 16:05, 23 April 2025 (UTC)[reply]

"first-preferences (among the remaining candidates)" is intended to mean exactly the same thing as "votes in the latest round of counting after redistribution": preferences that are first in the remaining ordering of candidates. There's no reason to think of it as redistributing anything: just look at the orderings and count how many voters have the candidate top in their remaining ordering. Redistribution is a crutch to explain it to people more used to systems where you only get to vote for one candidate. —David Eppstein (talk) 17:14, 23 April 2025 (UTC)[reply]

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The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:

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Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 07:52, 18 June 2025 (UTC)[reply]

Typo in Participation criterion section?

The participation criterion section says, "a set of ballots that all rank A>B should not switch the election winner from B to A." Shouldn't it instead say, "a set of ballots that all rank A>B should not switch the election winner from A to B"? Mariachiband49 (talk) 02:49, 2 July 2025 (UTC)[reply]

Clone-proofness of IRV?

Is IRV clone-proof? I was unable to find a source for this when I looked. 2A00:23C6:BB08:2D01:6C5F:7EA3:D9B6:2038 (talk) 18:29, 3 July 2025 (UTC)[reply]

Yes. See Instant-runoff_voting#Independence_of_clones_criterion and the links therein. meamemg (talk) 20:32, 3 July 2025 (UTC)[reply]