[EM] Definition of "sincere approval voting" (was FBC comparison: WV, margins, MMPO, DMC)
stepjak at yahoo.fr
Sun Sep 18 13:28:44 PDT 2005
--- Chris Benham <chrisbenham at bigpond.com> a écrit :
> This is my proposed clear definition:
> "An 'approval vote' is one that makes some approval distinction among
> the candidates. It is sincere if
> (1)the voter sincerely prefers all the approved candidates (or single
> candidate) to all the not approved candidates (or single candidate), and
> (2) it is how the voter would vote without any knowledge or guess as to
> how other voters might vote."
I have trouble with (2). We could assume that "how the voter would vote"
means optimal, above-mean approval strategy. But obviously that is a
problem for a definition of "sincerity." It would also make approval
Otherwise we could choose to not define "how the voter would vote." But
in that case nothing prevents a strategically unwise vote from being
sincere, so that I don't see how DMC could satisfy NZIS. You would have
to claim that DMC has no zero-info approval strategy.
> By this definition, DMC (like IRV and unlike WV) meets "No
> Zero-Information Strategy". No method can make it impossible for
> strategists to sometimes have an advantage, but it irks me that WV has
> non-obvious fairly sophisticated strategy for "zero-information" voters
> (random-fill and if you have a big ratings gap, equal-rank above it).
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