On 10/19/2012 04:35 AM, Michael Ossipoff wrote:
A few methods that pass CD:
ICT
Symmetrical ICT
MMPO
MDDTR
A few methods that fail CD:
Beatpath, RP, Kemeny, VoteFair, MinMax(wv) and apparently all
traditional unimproved Condorcet versions.
Approval and Score don't pass CD either. But, as I said before, it's
so easy to automatically avoid the chicken dilemma nuisance with a
rank method that there's no excuse for a rank method to fail CD, and
so no rank method that fails CD should be considered.
All of the methods above fail independence of clones. Therefore, I
disagree that "there is no excuse for a method to fail CD", unless you
can show that it's possible to construct a method that passes both clone
independence and CD. As it stands, the CD methods and the wv/margins
methods are mutually Pareto-nondominated with respect to each other*.
(That is, assuming that ICT reduces to Condorcet//FPP if there are no
truncated votes nor equal-rank ones. If that is wrong, please tell me
what method ICT reduces to when all voters rank every candidate, ranking
nobody equal.)
* Perhaps some of the CD methods dominate other CD methods, and perhaps
some of the non-CD methods dominate other non-CD methods, but that's
besides the point here.
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