[EM] "we only get one shot" (Re: RCV Challenge)

[Forest Simmons]

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.

I like the idea of RP or MAM determining a fixed Elimination order. I
wonder what Steve Eppley would say???

El mié., 5 de ene. de 2022 4:30 a. m., Kristofer Munsterhjelm <
km_elmet at t-online.de> escribió:

> On 05.01.2022 04:35, Forest Simmons wrote:
> > Kristofer and All,
> >
> > What I get from this is to use a Coombs/STV hybrid. Perhaps mostly
> > Coombs for Elimination and STV quotas for election ... something like
> that.
>
> It's a perhaps surprising but still nice observation that it doesn't
> matter how you eliminate candidates in STV as far as the DPC is
> concerned: as long as you do it one at a time, the criterion still holds
> because the election condition only looks at first preferences.
>
> I like the idea of using Ranked Pairs to determine the elimination
> order. Because RP passes LIIA, this gets rid of a major source of chaos
> in STV/IRV because the eliminations don't change the social order. Only
> the election and surplus distribution steps do that.
>
> It may be a mar on the perfect proportionality of STV that Ranked Pairs
> has a centrist bias (since it's a single-winner election method), and
> thus RP-STV would have some element of centrist/consensus bias. On the
> other hand, you could cast this as a feature rather than a bug: there's
> certainly no lack of polarization in the current political world, so
> perhaps a bit of centrist/consensus bias is not so bad.
>
>
> As for Coombs STV, that's certainly one possible interpretation of
> binomial STV. But if binomial STV *is* Coombs STV, then it definitely
> isn't monotone, because in the single-winner case it's just regular old
> Coombs.
>
> -km
>
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