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> Netflix doesn't weight those ratings any more highly than the 5-star ratings of someone who rates nearly everything as 5 stars. Is that fact or speculation?
by bcbrown 10y ago
> Netflix doesn't weight those ratings any more highly than the 5-star ratings of someone who rates nearly everything as 5 stars.
Is that fact or speculation? It's a common recommendation technique to find the mean rating for a person, and use that to normalize. Normalized score = (actual_score - mean_score + 2.5) for a 5-point scale, for example.
I have no insight into whether or not Netflix does something similar, but I'd be surprised if they don't.
- kartickv 10y agoDoesn't normalisation assume that a person who rates everything five-star has low standards? It may just be that that person rates something only if they're really (un)happy. Imagine two people watched 100 movies, and assessed them the same way, say that 20 are five-star, 20 are four-star, 20 are three-star, and so on. The first person rates all 100 movies, but the second one has a habit of writing a review only if he considers a movie excellent. Then your algorithm will wrongly discount the second person's ratings. Is this true in the real world? Have you found different people to have different habits, like rating everything vs rating only good movies vs rating only bad movies?