[EM] name of multi-winner method

Jobst Heitzig heitzig-j at web.de
Sun Nov 16 02:58:06 PST 2008


Hi Kristofer,

> That's just the multiwinner adaptation of IRV. 

I don't think so! The point is that the *candidates* provide the ranking 
from which the vote transfers are determined. The idea is to keep it 
maximally simple for the voters: they still vote for only one candidate.

I now realize that it is also different from STV in an important 
respect: there is no transfer of excess votes!

What I want with this method is a maximally simple multi-winner method 
that does not rely on lists but is focussed on individual candidates and 
that makes sure that all large-enough minorities are represented. It is 
not important that it results in proportionality, hence it needs no 
transfer of excess votes.

Perhaps this is actually a new method? If so, what would we call it?

Jobst

I don't think it has a
> formal name, but here's how I've defined (naive) multiwinner adaptations 
> in my simulations:
> 
> Take single-winner method X. Produce a social ordering, then if there 
> are k winners to be elected, pick the k highest ranked on the social 
> ordering, and elect them.
> 
> The social ordering of IRV is opposite of its elimination order: the one 
> who's eliminated in the first round is ranked last, and so on.
> 
> -- 
> 
> That is, unless "the next candidate on her list" is the next candidate 
> on the *candidate*'s list, in which case it would be a sort of 
> STV-Asset/Party-list hybrid.



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