Ranked Choice Including Pairwise Elimination: Difference between revisions

'''Ranked Choice Including Pairwise Elimination''' (abbreviated as '''RCIPE''' which is pronounced "recipe") is an election vote-counting method that uses ranked ballots and eliminates '''pairwise losing candidates''' (elimination-round-specific [[Condorcet loser criterion|Condorcet losers]]) when they occur, and otherwise eliminates the candidate who currently has the smallest top-choice count.

This method modifies [[Instant-Runoff Voting|instant runoff voting]] (IRV) by adding the elimination of relativepairwise Condorcetlosing loserscandidates. This addition reduces the failure rate for the [[Independence of irrelevant alternatives|Independence of Irrelevant Alternatives]] (IIA), which is the kind of failure that occurred in the the [https://en.wikipedia.org/wiki/2009_Burlington_mayoral_election[2009 Burlington mayoral election|2009 mayoral election in Burlington, Vermont]].  This check for pairwise losing candidates considers all the marks on all the ballots, which contrasts with the IRV method, which does not consider all the marks on all the ballots.

The last candidate to be eliminated is the runner-up candidate. If this counting method is used in the primary election of a major political party, and if the runoff or "general" election is counted in a way that is not vulnerable to vote splitting, then ideally the runner-up candidate would move to the runoff or general election along with the primary-election winner. SmallVery small political parties would not qualify to move their runner-up candidate to the runoff or general election.

Importantly, the runner-up candidate does not deserve to win any kind of elected seat. ThisInstead, meansthe thisRCIPE methodSTV isversion notshould suitablebe used for fillingelections that fill multiple seats, such as on a non-partisan city council or in a multidual-member legislative district.

IfThe thechoice of how to handle a ballot on which a voter does not mark any ovals for a candidate depends on how write-in candidates are handled. If write-in candidates are not allowed, thatan unmarked candidate iscan be ranked at the ranking level ''below'' the lowest ranking level, asshown ifon the voterballot. markedIf thewrite-in ovalcandidates forare allowed, an unmarked candidate can be ranked ''at'' the lowest ranking level shown on the ballot, and that level also would be used for a write-in candidate whose name does not appear on that ballot.

TheRCIPE STV is the multi-winner version of the RCIPE method, canwhich bemeans extendedit tofunctions electlike the [[Single transferable vote|Single Transferable Vote]] (STV) for electing multiple candidates,legislators suchwithin asthe same district, whenand electing non-partisan members of a city council,. or whenRCIPE electingSTV twooffers (orthese more)advantages representativesover fromplain the same district.STV:

* AfterDuring eachpairwise counting round all the ballots are re-counted, and transferred tobut the highest-ranked candidate (onballots that ballot) who has not yet been elected or eliminated. Some ballots will have reducedzero influence, ordo nonot influence,contribute ifany theyvotes alreadyto contributedeither partialside supportof tothe one-on-one or two candidates who have been electedmatches.