Re: Fw: Voting project

From: Skip Montanaro <skip_at_pobox_dot_com>
Date: Mon Aug 11 2003 - 16:31:48 CDT

Matteo> I'm completely ignorant about "Instant Run Off Ballots"...

Doug> The basic idea of IRV (or "choice voting" or "ranked preference
Doug> voting") is that if no candidate gets a majority, candidates can
Doug> them as their 2nd place, 3rd place etc. choice. This eliminates
Doug> the spoiler role, although it also changes the complexion of
Doug> voting in other ways.

David> To elaborate slightly. IRV lets voters pick an ordered list of
David> candidates. The tabulation goes through several rounds of
David> calculation, until one candidate gets a majority.

...

This is fascinating, though no doubt a little off-topic.

David> However, all styles of tabulation (by mathematical proof--not
David> given here, but it exists) produce results that are intuitively
David> "wrong" in some cases, IRV included. For example, suppose you
David> have these ballots:

...

Intuitively, it seems that in an election with a large number of voters the
scenario you describe would be much less likely to occur than in an example
as you described which has sort of "club size" numbers of ballots cast.
Does the math support my intuition?

Skip
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Received on Sun Aug 31 23:17:08 2003

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