Ranked Pairs: Difference between revisions

{{Wikipedia|Ranked pairs}}

The "'''Ranked Pairs'''" method (sometimes abbreviated as "RP") orwas '''Tideman'''created (namedin after1987 by [[Nicolaus Tideman]]). It is a [[voting system]] that selects a single winner using votes that express preferences. RPThe ranked-pairs method can also be used to create a sorted list of winners. RPRanked Pairs passes the [[Smith criterion]] and the [[Condorcet Criterionwinner criterion]], and(thus ismaking by definitionit a '''"[[Condorcet method]]'''"). RPThe ranked-pairs method has many variations such as the "[[Maximize Affirmed Majorities]]" (or "MAM") and "[[Maximum Majority Voting]]" (or "MMV") voting methods.

The RPranked-pairs procedure isworks as follows:

RPRanked Pairs can also be used to create a sorted list of preferred candidates. To create a sorted list, repeatedly use the procedure to do the following:

To create a sorted list, repeatedly use RP to* select a winner,

* remove that winner from the list of candidates,

* ...and repeat (to find the next runner up, and so forth). A simpler way to create the sorted list is simply to run RP once, and then use the resulting [[Condorcet ranking]] (when ignoring the defeats that were ignored by the RP procedure) as the RP ranking.