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A comment on Bayesian ranking of items with up and downvotes or 5 star ratings.

Re:Bayesian ranking of items with up and downvotes or 5 star... by albertoleal on Saturday October 31, 2015 @02:32AM (#10482000)
Here's a paper that analyzes various ways to rank items using upvotes/downvotes; and comes up with a way to determine which method is the best: http://www.dcs.bbk.ac.uk/~dell/publications/dellzhang_ictir2...

Also related: http://planspace.org/2014/08/17/how-to-sort-by-average-ratin...

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Re:Bayesian ranking of items with up and downvotes or 5 star... by rer0tsaz on Saturday October 31, 2015 @07:30AM (#10482389)
To summarize and paraphrase the paper:

> Every upvote should increase the score, every downvote should decrease the score and the more votes there are the less an additional vote should matter. Only "adding pretend votes" satisfies this.

That really puts into words why "adding pretend votes" just felt right to me in practice.

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