[EM] Can someone point me at an example of the nonmonotonicity of IRV?

[Juho]

On Aug 10, 2008, at 12:43 , Kristofer Munsterhjelm wrote:

> There's also the "it smells fishy" that nonmonotonicity - of any  
> kind or frequency - evokes. I think that's stronger for  
> nonmonotonicity than for things like strategy vulnerability because  
> it's an error that appears in the method itself, rather than in the  
> move-countermove "game" brought on by strategy, and thus one thinks  
> "if it errs in that way, what more fundamental errors may be in  
> there that I don't know of?". But that enters the realm of feelings  
> and opinion.

I think it would be a good practice to evaluate both the performance  
of a method with sincere votes and the performance when voters may be  
strategic.

IRV is quite good with strategies and less good with performance with  
sincere votes.

Of course different elections may have different requirements with  
respect to what kind of winners are good winners. This influences  
evaluation of the sincere votes part.

Juho





		
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