[EM] Question on RCV/IRV multi-seat method used in Minneapolis

[Jonathan Lundell]

On Sep 23, 2008, at 9:04 AM, Kathy Dopp wrote:

> Thanks for the info. Jonathan.
>
> Do you or does anyone know if this muti-seat IRV method that splits
> votes of voters to their second choice candidates after some winning
> candidates receive the threshold amount of votes, exhibits
> non-monotonicity or not like the normal IRV method does?  If so, is
> there an example posted somewhere?

STV is not monotonic.

There's a lot of literature on the subject.

http://www.cs.duke.edu/courses/fall06/cps296.2/stv_hard.pdf
http://www.math.nus.edu.sg/aslaksen/voting.html
<http://www.votingmatters.org.uk/> has a lot of material on STV.

Terry Bouricius posted a pretty reasonable defense of IRV's non- 
monotonicity: http://fairvote.org/monotonicity/



>
>
> Thanks.
>
> Kathy
>
> On Mon, Sep 22, 2008 at 7:35 PM, Jonathan Lundell  
> <jlundell at pobox.com> wrote:
>> On Sep 22, 2008, at 4:33 PM, Kathy Dopp wrote:
>>
>>> Does anyone know of another election scheme that allows for the  
>>> split
>>> of a vote into fractions?  Do other jurisdictions with IRV use
>>> fractions to transfer surplus votes over a threshold amount, other
>>> than Minneapolis?
>>
>> Scotland, among others.
>>
>> Though we typically don't call multi-seat STV "IRV".
>>
>>
>
>
>
> -- 
>
> Kathy Dopp
>
> The material expressed herein is the informed product of the author
> Kathy Dopp's fact-finding and investigative efforts. Dopp is a
> Mathematician, Expert in election audit mathematics and procedures; in
> exit poll discrepancy analysis; and can be reached at
>
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