[EM] Proportional election method needed for the Czech Green party - Council elections

[Peter Zbornik]

On Mon, May 3, 2010 at 10:16 PM, Kristofer Munsterhjelm <
km-elmet at broadpark.no> wrote:

> Peter Zbornik wrote:
>
>> Dear all,
>>  I am sending a post scriptum to the email below.
>>  1. The conservative method is only interesting if, the unambiguously
>> pre-elected president and vice president(s) are not in the set of
>> proportionally (for instance STV) elected council members.
>> 2. If the unambiguously elected president and vice president(s) is in the
>> set of proportionally (for instance STV) elected council members, then I
>> guess the conservative method would include the "optimal" method as a
>> special case (the optimal method was where the president and vice presidents
>> are elected from the proportionally elected council members).
>> 3. The number of pre-elected vice presidents in point 1 above can be zero.
>> The president is always unambiguously pre-elected.
>>  4. For completeness, I would like to add one additional requirement,
>> which I think can be resolved after the seletion of a good voting procedure.
>> Requirement: The selected council must contain at least X members of each
>> sex (gender-equality rule). X is specified before each election.
>> This gender rule is used in our organization today.
>>
>
> A simple way of doing this, if the council size (after president and VPs
> have been elected) is even, is to have two elections, each of a council size
> equal to half the assembly. Then, for the first, only elect women, and for
> the second, only elect men. Use the same ballots, but remove candidates of
> the sex you don't want.

I am affraid that this is not possible. First we have mostly odd-numbered
council sizes, and secondly the gender rule does not require that half of
the men should be men and the other half women.
Our current gender rule goes as following: "for every three members of the
body, there has to be one person of each sex". A five member council thus
has to have one woman and one man. For seven members it is two men and two
women.


> Methods like Schulze STV work by comparing possible councils to determine
> which are best. Thus, it may be possible to limit them to only consider
> "balanced" councils. I'm not sure how to do this in ordinary STV, however,
> since it doesn't work that way, and in any case, this would be untested.
>
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