pearson similarity computation over common ratings

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R yan
R yan 2014-4-18
I have two users u, v with their ratings of movies as rows in a matrix M. Iu and Iv are the movies rated by u and v. I want to compute the following s(u,v). It takes the movies common to u and v. The average rating of user u ( written as ru overbar) is also computed over the common movies. thanks

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