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

Michael Ossipoff email9648742 at gmail.com
Fri Dec 28 14:38:02 PST 2012


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

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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