Voting system criterion: Difference between revisions
Added brief intuitive rationales/descriptions for some of the criteria.
(→Miscellaneous criteria: Fixing link to Immunity from second place complaints) |
(Added brief intuitive rationales/descriptions for some of the criteria.) |
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== Relative importance of various criteria ==
A few criteria follow with an intuitive rationale for each. See the articles for their exact definition.
=== Essential criteria ===
Some criteria are very widely agreed to be important. Examples:
* [[Clone independence]]: Replacing a candidate with multiple near-identical candidates shouldn't change who wins.
* [[Pareto]]: If everybody prefers X to Y, then the method's ranking should also prefer X to Y.
=== Desirable criteria ===
Other criteria are also widely regarded as good, but there is disagreement over how important it is for a voting method to pass these (they are agreed to be desirable, but not necessarily essential):
* [[Independence of irrelevant alternatives]]: Removing a candidate who didn't win shouldn't change who wins.
* [[Monotonicity]]: Doing something clearly beneficial to a candidate's support shouldn't make that candidate lose.
* [[Summability criterion]]: All the data the method uses to call the election should be expressible as a short summary.
Sometimes desirable properties or criteria are called desiderata.
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== Types of criteria ==
=== Absolute criterion ===
An ''absolute criterion'' requires or prohibits some result due to some characteristic of a given a set of ballots. This is in contrast to the below-mentioned [[relative criterion]], which requires (or prohibits) a change in the election's result given some modification to the ballots.
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