On 5.6.2012, at 1.52, James Gilmour wrote:

>>> On 4.6.2012, at 19.18, James Gilmour wrote:
>>>> A system that counts the proportions at national level
>>>> (typically a multi-party system) would be more accurate. Also 
>>>> gerrymandering can be avoided this way.
>>> 
>>> Yes, the votes could be summed at national level and the seats 
>>> allocated at national level.  But you do not need to go to national 
>>> level to achieve proper representation.  Where the electors also want 
>>> some guarantee of local representation, a satisfactory compromise can 
>>> be achieved with a much more modest 'district magnitude' than one 
>>> national district.
> 
>> Juho > Sent: Monday, June 04, 2012 7:48 PM
>> In Finland there was a reform proposal that counted the 
>> proportions at national level, but the seats were still 
>> allocated in the existing districts. (Current government 
>> doesn't want to drive that proposal forward.) One can do this 
>> trick also with quite small districts. In Finland the size of 
>> the smallest districts is 6, but even smaller districts could work.
>> 
>> Both targets can thus be met simultaneously, accurate 
>> proportionality and local(ish) representation. All systems 
>> will however have some "rounding errors". In this proposal 
>> the seats of the parties are allocated to the districts so 
>> that the total sum of seats per district and seats per party 
>> are exactly correct, which means that some of the last seats 
>> have to be "forced to go right", and this may violate the 
>> personal interests of some candidates (some other party may 
>> get the seat with fewer votes), but in a rather random / 
>> unpredictable / unbiased way that people are likely to 
>> accept. Political proportionality in the districts is also 
>> not as accurate as at the national level, but I guess the 
>> national level proportionality is the one that counts.
>> 
>> In theory one could use this system also with single-member 
>> districts, but the "forcing" operations would already be quite 
>> violent. If current single-member district countries want to 
>> keep the idea of very local representation, one approach 
>> could be to use only slightly larger districts than today 
>> (maybe 3, 4), calculate proportionality at national level, 
>> and then allocate the seats to the districts using some 
>> similar algorithm as in the Finnish reform proposal. Just an 
>> idea, to keep as much of the familiar and maybe liked features 
>> of the existing system.
> 
> Iceland currently uses a system that sounds very like the Finish proposal.  
> Votes are tallied at national level and in six
> constituencies, each of which has nine constituency seats in parliament.  
> Nine additional "equalization seats" are distributed to
> constituencies and allocated to political parties so that the parliamentary 
> representation of each party and each constituency will
> reflect as closely as possible the total votes received.  This is done by 
> solving a pair of simultaneous equations!  It does have
> the effect you describe, forcing out some "constituency winners" and 
> replacing them with "equalisation candidates".  This seems to
> be accepted because the constitution demands that every vote shall have equal 
> value.

In the Finnish proposal there are no "equalization seats". There are only the 
regional seats that have been allocated to the districts in proportion to their 
population.

> 
> But of course, you don't need to do it this way, nor does the proportionality 
> have to be just "party PR".  With STV-PR in
> multi-member districts the voters have the power to choose the winning 
> candidates on whatever PR basis matters to those voters.   I
> do appreciate that STV is totally unacceptable to quite a number of the more 
> vociferous members of this list, but STV-PR does
> address effectively many of the issues that arise in electing properly 
> representative assemblies.

"party PR"
- can achieve accurate proportionality between parties
- does not (usually) support accurate proportionality between different 
sections of a party
- allows high number of candidates and seats per district
- some methods allow votes to parties only, some allow votes to individual 
candidates

"STV-PR"
- can achieve accurate proportionality between parties
- supports proportionality between different sections of a party
- allows only smallish number of candidates and seats per district
- allows voters to cast mixed votes that list candidates from more than one 
party
- works also in (non-political) elections with no party structure

Juho



> 
> James
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