The voting tool requires a numeric vote be placed on each candidate, which voters may not always be inclined to offer. All voting systems must offer a way register an abstention and without such an option I would question the validity of the results.
Indeed, the system described on the rangevoting website includes a "No opinion" option.
The homepage of the Center for Range Voting website only provides half of the story. In fact, the ballot page explicitly states:
{{{ Fedora Project has implemented Range Voting for this election, in particular the "Range (score-summing, blanks treated as zero score, no quorum rule)" range voting system. }}}
This rendition of range voting is described at the http://rangevoting.org/RuleD.html, where this particular system is mentioned as a form of Range Voting.
Wikipedia also describes the format we have used on their page about [http://en.wikipedia.org/wiki/Range_voting#Voting_system Range Voting] (which Paul linked to in his announcement), in particular:
{{{ If voters are explicitly allowed to abstain from rating certain candidates, as opposed to implicitly giving the lowest number of points to unrated candidates, then a candidate's score would be the average rating from voters who did rate this candidate. }}}
This matter was checked before the election system was deployed, as we wanted to ensure our implementation was in fact a valid form of range voting.
The CRV website is (mostly) dedicated to the form of range voting that a particular group wish to see implemented for US Presidential Elections.
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