On Tue, Nov 10, 2009 at 10:52 PM, Kristofer Munsterhjelm <km-el...@broadpark.no> wrote: > In the context of SEC, it would be: > > Voter submits two ballots - one is ranked and the other is a Plurality > ballot. Call the first the fallback ballot, and the second the consensus > ballot. > > If everybody (or some very high percentage, e.g. 99%) votes for the same > consensus ballot, it wins. Otherwise, construct a Condorcet matrix based on > the fallback ballots. Pick two candidates at random and the one that > pairwise beats the other, wins.
How do you pick the random candidates? For that to be clone independent, there would actually need to be 3 ballots: - consensus ballot If more than X% of the ballots pick the same candidate, then that candidate wins. - nomination ballot - fallback ranking 2 nomination ballots are picked to decide the candidate and the pairwise winner according to the rankings wins. However, as I said in my last post, the nomination ballot isn't strategy free. > To my knowledge, Random Pair is strategy-free. It might also be > proportional, but I'm not sure about that (partly because I'm not sure how > you'd define "proportional" for ranked ballots). The problem is picking the 2 candidates. If 2 are picked at random, then the method isn't clone independent. Also, it favours the condorcet winner, so may suffer from tyranny of the majority. However, if you had a divided society, then both ethnic groups would still have some say. For example, if the split was 55% (A) and 45 (B), and each ethnic group only voted for their own candidate, then the results would be 2 A's: 30% => ethnic group A wins A+B: 50% => ethnic group A wins (as they are the majority) 2 B's: 20% => ethnic group B wins Thus group B gets some power, but not proportional power. However, once the society starts working better, it would seamlessly transition to a near condorcet method. Also, in a divided society condorcet voting might reduce the issue directly. In both cases, there would be an incentive for politicians from ethnic group A to try to get support from voters in ethnic group B. OTOH, a random election method may not be the best plan in a society where corruption is a problem. ---- Election-Methods mailing list - see http://electorama.com/em for list info