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From Sean Owen <>
Subject Re: Recommender's formula
Date Mon, 26 Nov 2012 21:53:32 GMT
Right, it doesn't do that. This isn't a part of the similarity metric.
It's a decent idea, the only drawback being that you have to keep the
means around. The effect is small at scale. But yes it would probably
be a nice additional feature.

On Mon, Nov 26, 2012 at 9:32 PM, Paulo Villegas <> wrote:
> But once you have similarities computed, then you go on and use them to
> predict the rating for unknown items. It's this rating prediction the
> place in which mean centering (or, to be more general, rating
> normalization) is not done and could be done.

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