[dperfect]

What's the best way to apply the suggested solution to a numeric 5-star rating system (the author mentions Amazon's 5-star system using the wrong approach, yet the solution is specific to a rating system of binary positive/negative ratings)?

I suppose one could arbitrarily assign ratings above a certain threshold to "positive" and those below to "negative", and use the same algorithm, but I imagine there's probably a similar algorithm that works directly on numeric ratings. Anyone know? Or if you must convert the numeric ratings to positive/negative, how does one find the best cutoff value?

[dbaupp]

The author has also written http://www.evanmiller.org/ranking-items-with-star-ratings.ht... .

[amrrs]

What we do with 5-star rating system is completely ignore 2,3,4 stars which in a lot of ways just skew our analysis, hence ending up with a new score similar to Nps (5-star minus 1-star) / total stars

[overcast]

Why bother have a 5-star rating system then? Sounds like Netflix went down the right path, with thumbs up or thumbs down. People either zero it out, or give it five stars.