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R Data Analysis Projects
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Given a user rating matrix, where several users have rated several products, the goal of collaborative filtering is as follows:
The underlying premise of the collaborative filtering algorithm is that if two users agree on ratings for a large set of items, they may tend to agree for other items too. Let us use a small R code snippet to explain this concept. Assume we have seven products (A, B, C, D, E, F, G) and two users (user.a and user.b). We also have the ratings provided by both of the users for some of the products. The ratings are range of numbers from 1 to 5, with 1 indicating a poor rating, 5 indicating a good rating, and 0 indicating no rating.
The following is an R snippet for demonstration purposes:
> set.seed(100) > products <- c('A','B','C','D','E','F','G') > user.a <- c( 3, 0, 2, 5, 5, 0,1) > user.b <-...