[EM] Anyone got a good analysis on limitations of approval andrange voting?

[Andrew Myers]

Jonathan Lundell wrote:
> I don't have his proof in front of me (I'm on the road), but I'm pretty sure that it assumes ordinal ranking.
>   
It seems fairly obvious that the theorem also holds for ratings, because 
ratings can be projected onto rankings without affecting any of Arrow's 
criteria. To put it another way, the proofs I have seen all apply to 
range-based methods in a straightforward way--there needs to be some 
fiddling with the proof to deal with ties, but that issue is not essential.

Letting voters give ratings doesn't mean you escape Arrow's Theorem.

-- Andrew