[EM] ¿Why do some absolutely hate ScoreVoting and insist on Ranked Ballots?

Kristofer Munsterhjelm km_elmet at lavabit.com
Sat Apr 14 00:41:43 PDT 2012

On 04/13/2012 09:11 PM, ⸘Ŭalabio‽ wrote:
> ¡Hello!
> ¿How fare you?
> I have had interactions with people on this list hating rated
> ballots.  I have a question for them:
> If the ballot would allow both ratings and rankings, ¿would that be
> acceptable?
> The ballot could allow ranking or ratings with equal rankings or
> ratings allowed.  The rankings would then be converted to ratings
> like thus:


> ¿Would this be acceptable?

No, I don't think so. That is essentially a weighted positional system, 
and those are not very good at all. Every weighted positional system 
except Plurality fails the Majority criterion (unless you count DAC and 
DSC as weighted positional systems). No weighted positional system can 
satisfy the Condorcet criterion. Nor can they satisfy mutual majority 
(again, unless DAC and DSC count).

As soon as you make it a ranked method, the ranked method has to prove 
its worth in comparison to other ranked methods. Weighted positional 
systems are not very good at doing that as a class -- unless you 
absolutely have to have certain criteria (like FBC for Antiplurality).

More fundamentally, as Robert points out, people who dislike rating 
don't just dislike rating because they have some grudge against numbers. 
Robert dislikes rating - or rather, Score/Range - because it forces him 
to be strategic and because it's not clear how much he should rate 
someone even if he had been honest.

If you convert rankings to ratings like you suggest, then anybody who 
ranks gets that choice made for them. The ratings are preset; but the 
prospective voter *knows* that he could pick more freely if he rated 
instead of ranked. So the choice is no choice at all.

If you're going to reduce, reduce rating to ranking instead. Use 
cardinal weighted pairwise or approval weighted pairwise.

More information about the Election-Methods mailing list