[EM] IRV vs Condorcet vs Range/Score

[Chris Benham]

Dave Ketchum wrote:

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

Dave,
"Condorcet" isn't decisive enough to qualify as "a method". IRV is a method.
All I ask is that you specify some particular "Condorcet method" (i.e. a method
that meets the Condorcet criterion) that you are sure you prefer over IRV, so
that we can compare one method with another (and not one method with one
criterion).

49: A
24: B
27: C>B

A and C have only first-preference votes, A 49 and C 27.  Is that a "near tie"??

Chris  Benham



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



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