Bottom-Two-Runoff IRV: Difference between revisions
Better RCV
(Added text about BTR-IRV being distinct from Smith//IRV to clear up possible confusion on r/EndFPTP) |
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{{rename|from=Bottom-Two-Runoff IRV|to=Bottom-two-runoff-instant-runoff-voting method|reason=To give the article a name more likely to be accepted on [[English Wikipedia]]}}
The '''"bottom-two-runoff-instant-runoff-voting method'''" (or "'''BTR-IRV method'''", and sometimes called "Better RCV") is an [[election method]] that selects a single winner using votes that express ranked preferences. It is a [[Condorcet-IRV hybrid_methods|Condorcet-IRV hybrid]] distinct from other hybrids like [[Smith//IRV]].
The process: take the two options with the fewest first preference votes. The pairwise loser out of those two options is eliminated, and the next preferences from those ballots are redistributed. This process repeats until there is only one option remaining, and that remaining option is the winner.
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BTR-IRV is not the same as Smith-IRV or Benham's method, as they don't pass the same criteria.
===Simplified Variant===
If you remove the redistribution step, leaving the candidates in the initial 1st choice sort order for the entire process, BTR-IRV becomes [[Summability criterion|precinct summable]]. Vote counting only requires the 1st choice vote counts and the [[Pairwise preference|pairwise preference matrix]] from each precinct, not the complete ranking counts.
==External links==
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