[EM] Symmetrical-IC-Beatpath(lv)?

[Michael Ossipoff]

Kevin:

Thanks for pointing that out.

Yeah, SICB(lv) seemed too good to be true.

Ranking Favorite below Compromise, instead of equal-top, will increase
the losing-votes in a Favorite > Compromise defeat, thereby helping
Compromise if Beatpath(lv) is used.

Then, so far, among the methods that I know the properties of,
Symmetrical ICT is the best one, by strategy properties, complying
with: FBC, CD, Condorcet (defined to respect voter-intent), 0-info
Later-No-Help, and MMC unless there's a cycle among the
majority-preferred set.

It's necessary to give up a little, to get FBC ad CD, but it's well worth it.

Is the combination of FBC and CD incompatible with MMC, and with
Clone-Independence?

If so, FBC and CD are more important.

Mike Ossipoff

On Fri, Dec 28, 2012 at 12:40 PM, Kevin Venzke <stepjak at yahoo.fr> wrote:
> Hi Mike,
>
> It's been quite awhile, but when I was trying to devise new FBC methods, I got
> a strong sense that any kind of path tracing wasn't going to prove compatible
> with FBC. The consequences of tracing effects through multiple candidates seem
>
> too unpredictable to offer the guarantee, that you will never want to position
> your favorite candidate insincerely.
>
>
> ICA and ICT are two-step methods where the second step obviously satisfies
> FBC, and the first step is just carefully excluding some candidates in a way
> that doesn't disrupt the FBC compliance. If the second step didn't satisfy
> FBC I don't think Improved Condorcet would mitigate the issue. IC just refrains
> from doing something harmful of its own.
>
> The other Condorcet or Condorcet-like FBC methods are based on MinMax, which
> doesn't use paths either. So, I'm pessimistic that it can be done.
>
> Kevin
>
>
>
> ----- Mail original -----
>> De : Michael Ossipoff <email9648742 at gmail.com>
>> À : election-methods at electorama.com
>> Cc :
>> Envoyé le : Jeudi 27 décembre 2012 22h01
>> Objet : [EM] Symmetrical-IC-Beatpath(lv)?
>>
>> What if, in Symmetrical ICT, the top-count were replaced with Beatpath(lv)?
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