Re: [EM] name of multi-winner method

2008-11-16 Thread Kristofer Munsterhjelm

Jobst Heitzig wrote:

Dear folks,

I forgot the name of the following multi-winner method:

1. Each candidate ranks all candidates, herself on top.
2. Each voter votes for one candidate.
3. The candidate who holds the smallest number of votes is excluded and 
her votes are transfered to the next candidate on her list who is still 
in the race.

4. Step 3 is repeated until the sought number of candidates remains.

Does anyone know how this is called? Perhaps STV-something?


That's just the multiwinner adaptation of IRV. 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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Re: [EM] name of multi-winner method

2008-11-16 Thread Diego Santos
I think this method is Warren Smith's multiwinner poorest firstasset
voting with predefined lists.

2008/11/16 Jobst Heitzig [EMAIL PROTECTED]

 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.

 
 Election-Methods mailing list - see http://electorama.com/em for list info




-- 

Diego Renato dos Santos
Mestrando em Ciência da Computação
COPIN - UFCG

Election-Methods mailing list - see http://electorama.com/em for list info


[EM] Wiki on Electorama no longer maintained?

2008-11-16 Thread Jobst Heitzig
Does anybody know why the wiki on www.electorama.com is still not 
working properly?


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Re: [EM] name of multi-winner method

2008-11-16 Thread Jobst Heitzig
Of course! Thank you very much. I was not aware of the poorest first 
variant and thought that asset voting always involves a negotiation 
after the voting.


So, it could be called automatic bottom-up asset voting or so...

Diego Santos schrieb:
I think this method is Warren Smith's multiwinner poorest firstasset 
voting with predefined lists.


2008/11/16 Jobst Heitzig [EMAIL PROTECTED] mailto:[EMAIL PROTECTED]

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.


Election-Methods mailing list - see http://electorama.com/em for
list info




--

Diego Renato dos Santos
Mestrando em Ciência da Computação
COPIN - UFCG


Election-Methods mailing list - see http://electorama.com/em for list info


Re: [EM] name of multi-winner method

2008-11-16 Thread Juho Laatu
--- On Sun, 16/11/08, Jobst Heitzig [EMAIL PROTECTED] wrote:

 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.

Why not proportionality if you can also easily get that?

There are some problematic cases like many minor (minority) candidates ranking 
some very popular candidate as their second choice.

The minor candidates could also form groups that are likely to get many enough 
votes to get one of them elected and then all rank each others at top. (Then 
some same size groups could agree to rank each others next etc.) This way the 
method could become a bit more proportional.

Juho


P.S. Yes, this kind of methods are interesting since although this limits 
voters' freedom to rank candidates a bit this approach makes it possible to 
support higher number of candidates, keeps voting simple and avoids too short 
votes, and gives additional information on the opinion of the candidates to the 
voters (and also binds candidates to this).

P.P.S. If one wants to further simplify things one could allow the voters to 
name groups of voters (= ties allowed, or in practice these groups could have 
names). And further, one could use a tree like structure of the candidates 
(except that then we would already almost have party lists that you didn't 
want). Anyway, good to find a good balance between STV and simpler methods for 
each need.




  


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