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

[Peter Zbornik]

Dear Markus Schulze,

thank you for your reply.
Why do you recommend the first vice-president to be elected as the second
ranked of Schulze single-winner method and not the second ranked using the
Schulze proportional ranking method?
Do you have a strong oppinion in this issue?
What is the difference in the results of these two methods?
I guess that in the single winner case both the president and vice president
will belong to the biggest faction, while for the proportional ranking this
is the case only if the second largest faction will not get a droop quota of
votes.
In our party there is one tradition used in some parts of the party, which
says that if there are two competing factions with two candidates for
the presidential post, the candidate of the losing faction gets the first
vice presidential post.

Best regards
Peter Zborník

On Mon, May 3, 2010 at 11:52 AM, Markus Schulze <
markus.schulze at alumni.tu-berlin.de> wrote:

> Dear Peter Zbornik,
>
> > Is the winner of a single-winner Schulze election always
> > in the set of winners of a Schulze-STV election, if the
> > same ballots are used for both elections?
>
> If more than one seat has to be filled, then the winner
> of the Schulze single-winner election method is not
> necessarily in the winning set of the Schulze STV method.
>
> *********
>
> > If the answer to the question in my email below is no or
> > if the vice presidents sometimes are not members of the
> > set of Schulze-STV winners (which I guess can be the case
> > even in a council with 7 members, one prezident and 3 VPs),
> > then I can imagine that there could be a method, which
> > elected the rest of the council members after the the
> > president and vice presidents have been elected using
> > Schulze proportional ranking.
> >
> > Such an election method would sacrifice a proportionality
> > in the council in order to achieve proportionality in the
> > ordered set of the president and the vice presidents.
> >
> > The election of the rest of the council members would be
> > done to maximize the proportionality of the elected council,
> > maybe by using a modified version of Schulze-STV, where the
> > president and vice presidents would be considered elected
> > to the council at the start of the STV election, using the
> > same ballots as for the Schulze proportional ranking election.
> >
> > Thus, the rest of the council members would be elected in
> > such a way, that the council would be as much proportional
> > as possible.
> >
> > Would your software be able to handle this problem (possibly
> > after some slight modification)?
> > What methods would you recommend for this scenario?
>
> I recommend:
>
> --the president is the top-ranked candidate of the Schulze
>  single-winner ranking,
> --the vice president is the second-ranked candidate of the
>  Schulze single-winner ranking,
> --the other members of the council are chosen by the Schulze
>  proportional ranking method so that proportionality is
>  maximized.
>
> My software could handle this problem (after some slight
> modifications).
>
> Markus Schulze
>
>
> ----
> Election-Methods mailing list - see http://electorama.com/em for list info
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.electorama.com/pipermail/election-methods-electorama.com/attachments/20100503/0dbf8230/attachment-0004.htm>