[EM] Condorcet-like Ratings-based System

[Kevin Venzke]

Brian,

--- bql at bolson.org a écrit : 
>   Pairwise Rating Differential Summation (PRaDS, for short, if it catches 
> on)
> 
>   For N choices keep a tally matrix which is N by N.
>   For each pair of choices in a rated vote:
>  	If choice A is rated higher than choice B, add (A's rating minus 
> B's rating) to the tally entry (A,B)
>  	If choice B is rated higher than choice A, add (B's rating minus 
> A's rating) to the tally entry (B,A)
>   After all votes have been tallied, if (A,B) is greater than (B,A) then A 
> has 'defeated' B.
>   Examine all such relations and count up the defeats. The choice or 
> choices with the fewest defeats win.

I'm pretty sure the ideal strategy is to use the extreme ratings.

Using a Copeland-ish cycle-breaker like this could invite a clone problem,
since a party could run extra candidates just to add to other factions'
defeats.

But if I'm correct that it's best to use extreme ratings, and if every voter
does this, then there will never be a cycle, so no clone problem.

Kevin Venzke
stepjak at yahoo.fr


	

	
		
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