[EM] Sincere rankings in the methods comparison test
nkklrp at hotmail.com
Sun Jan 4 00:54:01 PST 2004
To dramatically bring out the difference between winning-votes and margins,
there should be examples in which some non-middle voters truncate their
rankings or reverse the order of their 2nd & last choices.
For IRV, sincere rankings are fine, because IRV has its serious strategy
problems even if everyone votes sincerely.
In Approval, everyone should vote strategically. When there's no information
about other voters' preferences or voting plans, people should vote for the
above-mean candidates. But if the voter doesn't have ratings, but only a
ranking of the candidates, then, as I said, s/he should vote for the best
half of the candidates. That means that, for a group having a particular
sincere ranking, half will vote for the middle candidate, as I was saying in
a previous posting.
So: Maybe specify everyone's sincere rankings, and then, for the actual
ballots, vary the strategy.
Have some examples where whole 1st-choice-cohorts refuse to rank a 2nd
choice or reverse their last 2 choices, in order to bring out the difference
between winning votes and margins.
Have voters in Approval vote for the best half of the candidates, meaning
that, for a group sharing a particular sincere ranking, half of them vote
for their middle candidate.
For IRV, have them all vote sincerely, to show what happens to them when
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