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Recommenderlab walkthrough 1-3
# How about after normalization?
qplot(getRatings(normalize(MovieLense, method = "Z-score")),
main = "Histogram of normalized ratings", xlab = "Rating")
summary(getRatings(normalize(MovieLense, method = "Z-score"))) # seems better
# Min. 1st Qu. Median Mean 3rd Qu. Max.
# -4.8520 -0.6466 0.1084 0.0000 0.7506 4.1280
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