[EM] Proportional multi-winner ranked voting methods - guidelines?

Juho Laatu juho.laatu at gmail.com
Thu Feb 23 15:09:59 PST 2017

I just note that it would be useful to have some numeric requirements available when the usefulness of different proportional voting methods is evaluated. Some useful numbers (and other requirements) could be the number of candidates per district (e.g. 200, maybe 30 for each party), number of seats per district (e.g. 30), number of districts (e.g. 15), variation in the size of the districts (e.g. from 3 to 30 seats), handling of "overflow" and "lost" votes (e.g. votes to small parties in a district that has only 3 seats), required accuracy of proportionality (e.g. droop or hare proportionality at national level, or separately at each district), requirement of equal treatment of parties that get their support from one district only vs. evenly from all districts, planned style and accepted complexity of the ballots or voting machines, ability to vote for individual candidates, ability to vote multiple individual candidates across party borderlines, accuracy of party internal proportionality, ability to vote for one's favourite party (e.g. vote to one candidate inherited by other candidates of the party).


> On 23 Feb 2017, at 20:56, Stéphane Rouillon <stephane.rouillon at sympatico.ca> wrote:
> I agree with Richard Lung: STV could very well fit for a country using many representatives in bigger districts. I do not understand Mr. Fobes critics'...
> Envoyé de mon iPhone
> Le 23 févr. 2017 à 13:43, James Gilmour <jgilmour at globalnet.co.uk> a écrit :
>>> Richard Fobes (VoteFair)  Sent: 23 February 2017 17:54
>>> However, as I stated before, STV would not provide fair results if it were used for a full national legislature.
>>> Recently, in Canada, some people have been promoting the idea of using STV to elect about 5 MPs (members of parliament) from
>>> each district (which they call a "riding").  That would produce very unfair results!
>>> That's what I had in mind when I referred to using STV repeatedly.
>> Please see the attached results of some STV-PR elections to the Northern Ireland Assembly.
>> If Canada had results like those from its Federal and Provincial elections no-one would be calling for electoral reform in Canada.
>> James Gilmour
>> Edinburgh, Scotland
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>> <NI Assembly 1998 & 2003.pdf>
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