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

[Markus Schulze]

Dear Juho,

I wrote (4 May 2010):

> This is my proposal:
>
> --Use the Schulze proportional ranking method.
>
> --The top-ranked candidate becomes the president.
>
> --The second-ranked candidate becomes the vice president.
>
> --If the first two candidates happen to be male, then,
>   when you calculate the third-ranked candidate, restrict
>   your considerations to female candidates.
>
>   If the first two candidates happen to be female, then,
>   when you calculate the third-ranked candidate, restrict
>   your considerations to male candidates.
>
>   The third-ranked candidate becomes the 2nd vice president.
>
> --The fourth-ranked candidate becomes the 3rd vice president.
>
> --The fifth-ranked candidate becomes the 4th vice president.
>
> --If 4 of the already elected candidates happen to be male,
>   then, when you calculate the sixth-ranked candidate, restrict
>   your considerations to female candidates.
>
>   If 4 of the already elected candidates happen to be female,
>   then, when you calculate the sixth-ranked candidate, restrict
>   your considerations to male candidates.
>
>   The sixth-ranked candidate becomes the 5th vice president.
>
> --The seventh-ranked candidate becomes the 6th vice president.

You wrote (5 May 2010):

> In the description of Markus Schulze there were two steps
> where the male/female proportionality was handled. That
> approach works if there are separate requirements for the set
> of three first (vice)presidents and the rest of the council
> members. My understanding is that in the Czech Green Party
> there are no such requirements on the presidents. In that
> situation it may be better to push the forced male/female
> election to the end of the list.

I prefer my proposal because of two reasons.

First: In my proposal, the fourth and the fifth candidate reduce
the distortion of proportionality that might be caused by the
specific choice of the third candidate. The seventh candidate
reduces the distortion of proportionality that might be
caused by the specific choice of the sixth candidate. In your
proposal, there are no candidates who reduce the distortion of
proportionality that might be caused by the gender requirements.

Second: I formulated by proposal in such a manner that it can
also be used to create party lists. Here, the gender requirements
say that, for every possible number M, at least M of the first
3*M places must be filled by male candidates and at least M of
the first 3*M places must be filled by female candidates.

Markus Schulze