I agree that the Droop quota or some similar quota should try to be satisfied. STV doesn't always satisfy it due to exhausted ballots. Vote-splitting does mean less proportional representation using STV if more candidates run relative to some groups' constituency share compared to other groups. That and all STV's other extreme flaws is why any of the other better proportional systems are more proportional and also better in a host of other ways.
On Sun, Nov 1, 2009 at 9:14 PM, Raph Frank <raph...@gmail.com> wrote: > On Sat, Oct 31, 2009 at 4:17 PM, Kathy Dopp <kathy.d...@gmail.com> wrote: >> I believe that you misunderstood what I was saying below. It is the >> relative *number* of candidates who run for office relative to the >> number of the voters they represent compared to the same ratio for all >> other candidates that determines whether or not STV achieves >> proportional representation. I.e. STV is subject to vote splitting or >> insufficient candidates running to represent any group of voters. > > Vote splitting is not a major issue with PR-STV. (it is also less of > an issue with IRV than it is with plurality). There can be some > tactics required due to the fact that voters don't always vote based > on party. > > If a party has 20%+ of the support in a 4 seater, it will get 1 seat. > (Assuming that the voters rank all the party's candidates as the top > ranks). > > As for insufficient candidates, well if a party doesn't run enough > candidates, then it is their own fault. > > It can be a problem where an incumbent doesn't want a 2nd candidate > from the party running, in case the 2nd candidate ends up winning a > seat. > -- Kathy Dopp Town of Colonie, NY 12304 phone 518-952-4030 cell 518-505-0220 http://utahcountvotes.org http://electionmathematics.org http://kathydopp.com/serendipity/ Realities Mar Instant Runoff Voting - 18 Flaws and 4 Benefits http://electionmathematics.org/ucvAnalysis/US/RCV-IRV/InstantRunoffVotingFlaws.pdf Voters Have Reason to Worry http://utahcountvotes.org/UT/UtahCountVotes-ThadHall-Response.pdf Checking election outcome accuracy --- Post-election audit sampling http://electionmathematics.org/em-audits/US/PEAuditSamplingMethods.pdf ---- Election-Methods mailing list - see http://electorama.com/em for list info