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Recommenderlab walkthrough 1-2
# Visualizing ratings
qplot(getRatings(MovieLense), binwidth = 1,
main = "Histogram of ratings", xlab = "Rating")
summary(getRatings(MovieLense)) # Skewed to the right
# Min. 1st Qu. Median Mean 3rd Qu. Max.
# 1.00 3.00 4.00 3.53 4.00 5.00
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