User:BetterVotingAdvocacy/Big page of ideas: Difference between revisions
User:BetterVotingAdvocacy/Big page of ideas (view source)
Revision as of 00:04, 15 June 2020
, 4 years ago→Rated pairwise preference ballot
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Though the most important transitivity requirements for rated pairwise are likely the ones based on margins (if 1st choice is 4 points better than 2nd choice, then they must be at least 4 points better than 3rd choice, etc.), it's also possible to require transitivity of score for a candidate across matchups i.e. if 1st choice was a 3 against the 2nd choice's 2, they can't then become a 2 against 3rd choice, even if 3rd choice would be scored at 1 or lower (which preserves the minimum transitive margin of 3-2=1 point).
The use of the rated pairwise ballot may increase the likelihood of a transitive result (i.e. having a Condorcet winner) relative to the use of a ranked ballot in Condorcet methods. This is because, when every voter casts a Score voting-style ballot (i.e. they score each candidate the same in all of their matchups), the Score winner will be the CW. In fact, it is possible to mathematically determine how secure a "rated CW" (the CW according to rated pairwise) is in avoiding being in a cycle (having a pairwise defeat) by looking at their pairwise margins against every other candidate. In other words, if using a score scale of 0 to 5, if the rated CW's weakest pairwise victory has a 6-point margin when every voter votes Score-style, then even if one of the voters now switches to cast a non-Score-style ballot (i.e. they increase their pairwise power in at least one matchup beyond what Score voting would allow), the most this can do is make the rated CW have only a 1-point margin victory.
=== Connection between Condorcet, Smith set, and Asset ===
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