[EM] Median-based Proportional Representation

[Toby Pereira]

Is this just the Instant Run-off version of STV that you're talking about that 
pays no attention to who you ranked below top? Also your example here - 
http://rangevoting.org/PRcond.html - would that be resolved under any form of 
STV in existence?




________________________________
From: Warren Smith <warren.wds at gmail.com>
To: Jameson Quinn <jameson.quinn at gmail.com>
Cc: election-methods <election-methods at electorama.com>
Sent: Sat, 9 July, 2011 19:38:13
Subject: Re: [EM] Median-based Proportional Representation

> In AT-TV, suppose
> 30% of the voters vote Red=9, Blue=Green=0;
> 30% of the voters vote Blue=9, red=green=0;
> 40% of the voters vote Green=5, red=blue=4.
> Will it then elect 30% reds, 30% blues, and 40% greens?
> And do you consider that the right thing to do?

--(in this situation, by the way, I think
RRV would elect <=20% Greens and the rest would be evenly split between
reds and blues.)

RRV incentivizes exaggerating in your vote to max and min scores; but it also
de-incentivizes that because if you exaggerate then your vote gets
de-weighted more
when your guy wins a seat.  So the net result is probably that you are
incentivized
to exaggerate on candidates whose winning chances seem poor,
but to try to "free ride" for candidates that seem sure-thing winners by
dishonestly not giving them high scores.

With STV, a big flaw is that it pays no attention to anybody you
ranked below top.
If you ranked    Bush>Gore>>>Hitler, it pays no attention to the "Gore>>>Hitler"
part of your vote, until after Bush is elected.    And basically, any
party voter-bloc
which ranks Green-party candidates above all others, will have zero effect on
non-Green winners until after the last Green has won, then some small
fraction of
"leftover" green power will be able to exert some (tiny and varying with
the size of the leftover in a rather random-seeming way) effect.

This ignoring, seems a very serious flaw of STV, that is not present with RRV.


-- 
Warren D. Smith
http://RangeVoting.org  <-- add your endorsement (by clicking
"endorse" as 1st step)
and
math.temple.edu/~wds/homepage/works.html
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