Facts about the Copeland Score

Yesterday, I wrote about the Copeland score as a measure of an election system, and showed that the Borda Count can not have a winner with a Copeland score of 0. I made it fairly clear that allowing a Copeland score of 0 to win would be a bad thing, but I want to add some context to that.

Thus, I’ve written up a more complete exposition about the Copeland score. You’ll see that while having a high Copeland score is possible, the worst case scenario, even with Copeland-conscious systems, can be pretty bad.

Inside, I review the ideas of the Copeland score and Copeland n-vulnerability, then derive some bounds on vulnerability for voting systems. Next will be some more applied results, using simulations to look at these quantities. Comment below to add to the discussion!

Copeland Score Facts

-Barry