[EM] What is FBC/SF

[Chris Benham]

Michael Ossipoff wrote:

>Is it [SF] the version of FBC that is being used in San Francisco?
>

"Sincere Favourite" (SF) is Kevin Venzke's more 'technical', 
easier-to-test-for version of the
Favourite Betrayal Criterion (FBC).

>
>       *Sincere Favorite*.
>
> /Suppose a subset of the ballots, all identical, rank every candidate 
> in S (where S contains at least two candidates) equal to each other, 
> and above every other candidate. Then, arbitrarily lowering some 
> candidate X from S on these ballots must not increase the probability 
> that the winner comes from S./
>
> A simpler way to word this would be: /You should never be able to help 
> your favorites by lowering one of them./
>
> The specific purpose behind this criterion is to ensure that voters 
> need not worry that by listing multiple favorite candidates, they 
> won't thereby cause one of those candidates to lose the election. If 
> voters lack this confidence, they may choose to simply not rank the 
> candidates they believe aren't likely to win, in order to keep them 
> "out of the way" of candidates who might be able to win.
>
http://nodesiege.tripod.com/elections/

I like this version, but it is much less well known than FBC and is 
almost the same thing, so I sometimes refer to "FBC/SF".

Chris Benham






-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.electorama.com/pipermail/election-methods-electorama.com/attachments/20070314/7f8a6630/attachment-0003.htm>