Hi Ben, I've pushed at EM a minor adjustment to IRV that solves the problem you posed. The idea is to require voters to vote for only 3 candidates and then count the number of times each candidate is ranked to determine 3 finalists and then use a ranked vote to determine the winner. In each of the cases below, assuming the top 3 get ranked, C wd be eliminated first by virtue of how none of the 40% voters ranked C. In that case, the second group would consistently rank B as their top candidate in the second stage and B would consistently win the second and final stage.
So IRV is easy to tweak to solve your dilemma. This fix also makes the vote summarizable at the precinct level in a faster manner and it encourages voters to rank multiple candidates since lower-rankings will be more likely to make a diff in the first stage to determine the final three and it's much simpler than Bucklin or other voting rules. dlw Message: 1 Date: Sat, 15 Jun 2013 23:26:25 -0400 From: "Benjamin Grant" <[email protected]> To: <[email protected]> Subject: [EM] Absolutely new here Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" I just started trying to wrap my brain around all the ins and outs about voting methods, and I wanted to check two things with my elders (on this subject): 1) As far as I can see, the reason IRV has some strange/unusual results is because it is absolutely critical what order you eliminate candidates. So an election where Voting Bloc 1 has a 13% share of the ballots and Voting Bloc 2 has a 16% share of the ballots can utterly flip around using IRV if VB1 goes up two points and VB2 goes down 2. Because with IRV, the order of elimination is really the first-most deciding factor in who wins. For example, here are three different scenarios: 40% A B D C 25 C B D A 20 D B C A 15 B A C D WINNER: A (the topline means of course that 40% put candidate A first, B second, D third, and C last.) 40% A B D C 25 C B D A 26 D B C A 9 B A C D WINNER: D 40% A B D C 25 C B D A 17 D B C A 18 B A C D WINNER: B A few percent either way on the last line changes *everything*. This seems to be a flaw with IRV, yes? It is "too sensitive" on small changes because they can change the order of elimination. dlw
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