The measure of the accuracy of a voting system is Bayesian regret. That is, if voters want a centrist they should get a centrist, or if they want a leftist they should get a leftist. Analysis shows approval voting is exceptional at representing what the voters actually want.

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Later no harm is a nonsense criterion.

http://scorevoting.net/LNH

Advocate of Score Voting and Approval Voting. Software engineer. Father. Husband. American.

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