Majority Acceptable Score voting: Difference between revisions
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* Voters rate candidates 0, 1, or 2. |
* Voters rate candidates 0, 1, or 2. |
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* Any candidate rated 0 by a majority is eliminated, if any would remain. |
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* Eliminate any candidates with a majority of votes at or below a number, while some other candidate (or candiadates) has a majority strictly above that number. That is, keep only those with the highest median. For instance, any candidate rated 0 by a majority is eliminated, unless that eliminates all candidates. |
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** (If there are any candidates rated 2 by a majority, you should eliminate any who aren't. But a majority-2 candidate would probably win in the next step anyway, so this step is probably superfluous. It's just included because it's part of Bucklin voting, which was used in over a dozen US cities, and thus it gives this method a stronger pedigree.) |
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* Then the points are added up for the remaining candidates, and the highest points wins. |
* Then the points are added up for the remaining candidates, and the highest points wins. |
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Revision as of 15:03, 19 October 2016
Majority Acceptable Score voting works as described below. Technically speaking, it's the graded Bucklin method which uses 3 grade levels and breaks median ties using Score voting.
- Voters rate candidates 0, 1, or 2.
- Any candidate rated 0 by a majority is eliminated, if any would remain.
- (If there are any candidates rated 2 by a majority, you should eliminate any who aren't. But a majority-2 candidate would probably win in the next step anyway, so this step is probably superfluous. It's just included because it's part of Bucklin voting, which was used in over a dozen US cities, and thus it gives this method a stronger pedigree.)
- Then the points are added up for the remaining candidates, and the highest points wins.
Blank votes are counted as ratings of 1 or 0 in proportion to the fraction of all voters who gave the candidate a 2. For example, a candidate could not win with more than 71% blank votes, because even if the other 29% are all 2-ratings, that would leave 71%*71%=50.41% 0-votes, enough to eliminate.
Here's a google spreadsheet to calculate results: [1]. On page 2, it has some hypothetical results for the Egypt 2012 election, showing that this system could have elected a reformer over Morsi, despite vote-splitting among the various reformers. IRV could have elected Morsi.