<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:13px"><div>From: Vidar Wahlberg <canidae@exent.net><br>To: "election-methods@lists.electorama.com" <election-methods@lists.electorama.com> <br>Sent: Sunday, 9 November 2014, 18:01<br>Subject: Re: [EM] Preferential Party-List Proportional Representation (PPLPR)<br> </div><div>On Sun, Nov 09, 2014 at 02:57:57PM +0000, Toby Pereira wrote:<br>>> The problem is how you want to define a proportional system. As you<br>>> say, cardinal systems handle this better because you know how much<br>>> support B really has, and you can allocate accordingly. But when you<br>>> have ranks, it would go against how most people would define<br>>> proportionality. I would say that if a certain proportion of people<br>>> rank a certain party top, then that party should get
that proportion<br>>> of seats, subject to rounding errors.</div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif; font-size: 13px; font-style: normal; background-color: transparent;"><br></div><div>>If the definition of PR systems is that parties should receive as much<br>>proportion of the seats as proportion of voters who rank that party at<br>>top, then I agree, PPLPR obviously does not do that.<br>>Interestingly, that more or less exclude every single other system than<br>>plurality systems, with the possible exception of systems where voters<br>>can split their vote. Even STV would not meet this definition; A<br>>party/candidate could receive votes from later preferences and gain<br>>representation beyond rounding errors. Using my previous example, B<br>>could, depending on the STV implemention, win a seat in a 6-seat<br>>election (16.7%)
with only 1 of 401 votes (0.25%).</div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif; font-size: 13px; font-style: normal; background-color: transparent;"><br></div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif; font-size: 13px; font-style: normal; background-color: transparent;">I should have specified that parties should receive a *minimum* of the proportion of seats equal to the proportion of top ranks, rounded down.<br></div></div></body></html>