<div dir="auto">I'm sure it's more subtle than Coombs because Binomial STV, like Proportional Approval Voting PAV, [according to the impression I have], is supposed to evaluate slates of candidates before definitively eliminating anybody.<div dir="auto"><br></div><div dir="auto">I like the idea of RP or MAM determining a fixed Elimination order. I wonder what Steve Eppley would say???</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">El mié., 5 de ene. de 2022 4:30 a. m., Kristofer Munsterhjelm <<a href="mailto:km_elmet@t-online.de">km_elmet@t-online.de</a>> escribió:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 05.01.2022 04:35, Forest Simmons wrote:<br>
> Kristofer and All,<br>
> <br>
> What I get from this is to use a Coombs/STV hybrid. Perhaps mostly<br>
> Coombs for Elimination and STV quotas for election ... something like that.<br>
<br>
It's a perhaps surprising but still nice observation that it doesn't<br>
matter how you eliminate candidates in STV as far as the DPC is<br>
concerned: as long as you do it one at a time, the criterion still holds<br>
because the election condition only looks at first preferences.<br>
<br>
I like the idea of using Ranked Pairs to determine the elimination<br>
order. Because RP passes LIIA, this gets rid of a major source of chaos<br>
in STV/IRV because the eliminations don't change the social order. Only<br>
the election and surplus distribution steps do that.<br>
<br>
It may be a mar on the perfect proportionality of STV that Ranked Pairs<br>
has a centrist bias (since it's a single-winner election method), and<br>
thus RP-STV would have some element of centrist/consensus bias. On the<br>
other hand, you could cast this as a feature rather than a bug: there's<br>
certainly no lack of polarization in the current political world, so<br>
perhaps a bit of centrist/consensus bias is not so bad.<br>
<br>
<br>
As for Coombs STV, that's certainly one possible interpretation of<br>
binomial STV. But if binomial STV *is* Coombs STV, then it definitely<br>
isn't monotone, because in the single-winner case it's just regular old<br>
Coombs.<br>
<br>
-km<br>
</blockquote></div>