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

[Jonathan Lundell]

On Apr 27, 2010, at 6:09 AM, Jameson Quinn wrote:

> 2010/4/27 Raph Frank <raphfrk at gmail.com>
> On Tue, Apr 27, 2010 at 7:19 AM, Jameson Quinn <jameson.quinn at gmail.com> wrote:
> > Why not:
> > - ranked votes
> > - STV for council. Keep track of which members are elected first and second,
> > one of them will be VP.
> > - Condorcet winner among the councilmembers is P. (You could use original
> > ballots or have the council revote.)
> > - VP is first councilmember, or, if that person is P, second councilmember.
> 
> The order of election with PR-STV shouldn't be used to determine VP,
> all seats are equal.
> 
> Why?
> 
> Actually, it could be "first seat", or "plurality winner", which is mostly equivalent. This would help IFF you wanted to increase decrease the probability of a simple majority disproportionately sweeping P and VP. Since it's only VP we're talking about, the chance of plurality-style strategy is slim.

The problem with FPTP in this case is that it's largely accidental. In the obvious counterexample, a significant majority of voter splits their vote across several clones, causing their representatives to be elected late, even though they have the most support.

One way to order the winners in an STV election is to count for the the original board, and then re-count for successively smaller groups, but with only the most recent winners eligible, giving a complete ordering of the board.
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