[EM] IRV in San Francisco
eric at ericgorr.net
Fri Nov 12 10:48:23 PST 2004
At 1:47 PM -0500 11/12/04, Dave Ketchum wrote:
>On Fri, 12 Nov 2004 13:06:23 -0500 Eric Gorr wrote:
>>At 7:44 AM -0800 11/12/04, Justin Sampson wrote:
>>>On Fri, 12 Nov 2004, Eric Gorr wrote:
>>> > Well, it will cause IRV to fail the Independence of Clones Criterion and
>>>> thereby be subject to a spoiler effect again.
>>>Doesn't IRV suffer from spoiler effects anyway?
>>The method itself passes the ICC, so spoilers cannot come from there.
>>It, of course, fails IIA (as all ranked ballot methods do), so
>>spoilers in this context still exist. Of course, since no ranked
>>ballot methods pass IIA, talking about spoilers in this context is
>>not very interesting.
>>Are there more directions from which spoilers can appear?
>>I am currently not aware of any.
>I do not keep up with the alphabet soup, but IRV and Condorcet disagree as
>to winner in the following, and I see Nader as a spoiler for IRV:
>35 Nader, Kerry
>Condorcet sees 35 Nader as ignorable and then 60 Kerry vs 40 Bush
>IRV discards 25 Kerry; then sees 40 Bush vs 35 Nader.
Unless I am mistaken, this would show a failure of Independence of
Irrelevant Alternatives (IIA).
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