On 5 Feb 2013, at 9:50 AM, Peter Zbornik <pzbor...@gmail.com> wrote: > Dear all, > > We recently managed, after some effort to elect some people in our > party using STV (five of seven board members of the Czech Green Party > and more recently some people to lead the Prague organisation etc.). > We used standard fractional STV, with strict quotas, valid empty > ballots, Hagenbach-Bischoff quota, no Meek. > It was the first bigger usage of STV in the Czech republic. > As a footnote, I would like to add, that one big advantage of > proportional election methods, is that it elects "the best people", > i.e. meaning the people, who have the biggest support in the > organisation. > > Now we would like to go on using STV for primary elections to party > lists in our party. > I have a good idea on how to do it using proportional ranking, but am > not entirely confident in how to implement the gender quotas. > So here I would like to ask you, the experts, for help. > I have only found some old papers in election-methods, but they are > not of any great help to resolve the following problem, unfortunately. > > The problem (after a slight simplification) is as follows: > We want to elect five seats with any proportional ranking method (like > Schulze proportional ranking, or Otten's top-down or similar), using > the Hagenbach-Bischoff quota > (http://en.wikipedia.org/wiki/Hagenbach-Bischoff_quota) under the > following constraints: > Constraint 1: One of the first two seats has to go to a man and the > other seat has to go to a woman. > Constraint 2: One of seat three, four and five has to go to a man and > one of those seats has to go to a woman.
Why the two constraints, as opposed to a single constraint the overall gender distribution must be 3:2 or 2:3? Constraints are hard enough (OK, impossible in the general case) to square with proportionality without making them stricter than required. > Say the "default" proportional ranking method elects women to all five > seats, and thus that we need to modify it in a good way in order to > satisfy the constraints. > > Now the question is: How should the quoted seats be distributed in > order to insure > i] that the seats are quoted-in fairly proportionally between the > voters (i.e. the same voters do not get both quoted-in seats) and at > the same time > ii] that the proportional ranking method remains fairly proportional? Define "fairly proportional", please. ---- Election-Methods mailing list - see http://electorama.com/em for list info