Bayesian ranking of items with up and downvotes or 5 star ratings
julesjacobs.github.io/2015/08/17/bayesian-scoring-of-ratings.html
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Evan Miller wrote a great article How Not To Sort By Average Rating. He shows that simple formulas like score = upvotes - downvotes or score = upvotes / (upvotes + downvotes) don
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