The Wilson score's method seems to have been inspired by this post, "How
not to Sort by Average Rating"

http://www.evanmiller.org/how-not-to-sort-by-average-rating.html

Here is a better method for star ratings from the same author:

http://www.evanmiller.org/ranking-items-with-star-ratings.html

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https://bugs.launchpad.net/bugs/894468

Title:
  Statistics algorithm for sorting ratings looks fishy

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