Strategy under CPO-STV
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French Guy
May 6, 2015, 4:59:31 AM5/6/15
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Hello,
one very simple question.
Under CPO-STV, is it possible for a majority of 51% to strategically garner all the seats? That could be done, it seems, through the use of voting cards asking to bury below the Nth rank all of those who are not part of the N-member group.
Am I right?
one very simple question.
Under CPO-STV, is it possible for a majority of 51% to strategically garner all the seats? That could be done, it seems, through the use of voting cards asking to bury below the Nth rank all of those who are not part of the N-member group.
Am I right?
Warren D Smith
May 6, 2015, 12:31:55 PM5/6/15
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Actually, I had no remembrance what CPO-STV was, but I see wikipedia knows:
http://en.wikipedia.org/wiki/CPO-STV
That's the good news. The bad news is, I cannot understand what CPO-STV is
from the wikipedia description. They need to provide a formal
algorithm, but did not.
Wikipedia claims it is a PR (proportional representation) system.
That should mean (assuming that is not meaningless propaganda, but
rather actually supported/defined by a theorem -- which is probably
is, since its inventor N.Tideman had a pro-theorem attitude in these
matters) that the answer is NO:
i.e, CPO-STV has the property that a 51% voter bloc is NOT able
to dictate 100% of the winners. Instead, the remaining 49% are able to dictate
about 49% of the winners.
Some older forms of STV (e.g. Meek's method) certainly have this PR property,
and CPO-STV was intended to be an improvement upon them that preserved
a PR property.
I have Tideman's book someplace and it should say more, but I haven't
got it right now.
Plainly CPO-STV is a complicated voting method.
--
Warren D. Smith
http://RangeVoting.org <-- add your endorsement (by clicking
"endorse" as 1st step)
http://en.wikipedia.org/wiki/CPO-STV
That's the good news. The bad news is, I cannot understand what CPO-STV is
from the wikipedia description. They need to provide a formal
algorithm, but did not.
Wikipedia claims it is a PR (proportional representation) system.
That should mean (assuming that is not meaningless propaganda, but
rather actually supported/defined by a theorem -- which is probably
is, since its inventor N.Tideman had a pro-theorem attitude in these
matters) that the answer is NO:
i.e, CPO-STV has the property that a 51% voter bloc is NOT able
to dictate 100% of the winners. Instead, the remaining 49% are able to dictate
about 49% of the winners.
Some older forms of STV (e.g. Meek's method) certainly have this PR property,
and CPO-STV was intended to be an improvement upon them that preserved
a PR property.
I have Tideman's book someplace and it should say more, but I haven't
got it right now.
Plainly CPO-STV is a complicated voting method.
--
Warren D. Smith
http://RangeVoting.org <-- add your endorsement (by clicking
"endorse" as 1st step)
French Guy
May 6, 2015, 11:29:00 PM5/6/15
to electio...@googlegroups.com
Yes, it's classified by James Green-Armytage as a Condorcet-Hare hybrid.
Here's a page with an example: http://wiki.electorama.com/wiki/CPO-STV
Here's a page with an example: http://wiki.electorama.com/wiki/CPO-STV
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