[EM] [RangeVoting] IRV vs Condorcet vs Range/Score

[Dave Ketchum]

Let's see:

A Condorcet method finds the candidate which would beat each other 
candidate in a run-off election, assuming such a candidate exists.  Thus 
such a method meets the Condorcet criterion.

Having copied such from Wikipedia, don't seem like I grabbed much.

Having no such candidate, we have a cycle of three or more leaders in a 
near tie and debate how to pick from them.

Perhaps Chris is into this debate, which I agree is important but am trying 
to keep out of this thread, whose business is IRV vs non-IRV.

Perhaps there are other exceptions.

DWK

On Fri, 10 Oct 2008 13:26:55 -0400 Terry Bouricius wrote:
> Dave,
> 
> You are using the term "Condorcet" in a way that is increasingly common, 
> but confusing to election method theorists, to mean a ranked voting method 
> that is easiest to explain by imagining a series of one-on-one comparisons 
> using a ranked ballot. What Chris B. was getting at is that Condorcet is a 
> CRITERION (in fact there is also a Condorcet-loser criterion, which I 
> think is more useful), which is used in evaluating voting methods, rather 
> than an actual voting method itself. There are probably a dozen different 
> voting methods that are Condorcet compliant, and many others that aren't 
> (complying with other criteria that some believe are more crucial). The 
> issue separating the various Condorcet methods is how you find a winner 
> when there is no Condorcet winner.
> 
> Terry Bouricius
> 
> ----- Original Message ----- 
> From: "Dave Ketchum" <davek at clarityconnect.com>
> To: <RangeVoting at yahoogroups.com>
> Cc: <davek at clarrityconnect.com>; "EM" 
> <election-methods at lists.electorama.com>
> Sent: Friday, October 10, 2008 1:02 PM
> Subject: Re: [EM] [RangeVoting] IRV vs Condorcet vs Range/Score
> 
> 
> Took a while to decipher what you meant.
> 
> Others seem to realize my topic is Condorcet vs IRV, both almost twin rank
> methods.
> 
> While I do have preferences among methods, this thread is into those two
> without considering what else I might prefer.
> 
> DWK
> 
> On Thu, 9 Oct 2008 21:59:11 -0700 (PDT) Chris Benham wrote:
> 
>>Dave Ketchum wrote:
>>I started this thread to compare IRV vs Condorcet, believing that IRV is
>>provably less capable and deserves discarding.
>>
>>Dave,
>>Comparing a decisive method  with a criterion is a bit like comparing a
>>person with  "virtue".  As soon as you tell us which  *decisive method*
>>you support  I will be happy to discuss its comparison with IRV.
>>
>>Or failing that, perhaps you could give us some clue as to what method
>>you support by telling us some other criteria besides the Condorcet 
>>Criterion
>>that you think a method should meet.
>>
>>Chris Benham
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