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Oh, I agree that in the US, RCV is (unfortunately) often conflated with IRV. > I've wondered if IRV couldn't be substantially improved by using ... rather than

by vitus 5y ago

Oh, I agree that in the US, RCV is (unfortunately) often conflated with IRV. > I've wondered if IRV couldn't be substantially improved by using ... rather than eliminating the candidate with the least first-choice options. This is exactly the family of RCV systems -- IRV merely defines one implementation by which a winner is selected from a ranked ballot. Borda count has its own pathologies, too -- the usual cited problem is that it fails independence of irrelevant alternatives. https://en.wikipedia.org/wiki/Independence_of_irrelevant_alternatives https://en.wikipedia.org/wiki/Independence_of_irrelevant_alt... (Further, Borda count fails the majority criterion, namely there are situations where a candidate is the first pick of a majority of the electorate, yet fails to win. Some proponents of Borda count argue this is a feature, not a bug.) The wiki article for Borda count has a solid table of various voting systems and whether they satisfy various criteria: https://en.wikipedia.org/wiki/Borda_count#Other_properties https://en.wikipedia.org/wiki/Borda_count#Other_properties

elihu 5y ago
You're right that Borda count on its own isn't a great system. Though an RCV-style system that eliminates candidates on the basis of least-Borda count would be something else. It might be better than either normal IRV or plain Borda count on their own. (Though I still think I'd rather go with approval voting or STAR.)
- vitus 5y ago
  It sounds like you're referring to https://en.wikipedia.org/wiki/Nanson%27s_method https://en.wikipedia.org/wiki/Nanson%27s_method and the related Baldwin's method, which, while being Condorcet methods, both fail monotonicity.
  - elihu 5y ago
    I looks like what I was thinking of is Baldwin's method, actually. Failing monotonicity is still a problem, but it's actually pretty cool that it satisfies the Condorcet criterion. That seems like a pretty big step up from plain IRV.

by vitus 5y ago

elihu 5y ago

You're right that Borda count on its own isn't a great system. Though an RCV-style system that eliminates candidates on the basis of least-Borda count would be something else. It might be better than either normal IRV or plain Borda count on their own. (Though I still think I'd rather go with approval voting or STAR.)

vitus 5y ago
It sounds like you're referring to https://en.wikipedia.org/wiki/Nanson%27s_method https://en.wikipedia.org/wiki/Nanson%27s_method and the related Baldwin's method, which, while being Condorcet methods, both fail monotonicity.
- elihu 5y ago
  I looks like what I was thinking of is Baldwin's method, actually. Failing monotonicity is still a problem, but it's actually pretty cool that it satisfies the Condorcet criterion. That seems like a pretty big step up from plain IRV.