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Recommenderlab walkthrough 1-5
# What is the mean rating of each movie
qplot(colMeans(MovieLense), binwidth = .1,
main = "Mean rating of Movies",
xlab = "Rating",
ylab = "# of movies")
# The big spike on 1 suggests that this could also be intepreted as binary
# In other words, some people don't want to see certain movies at all.
# Same on 5 and on 3.
# We will give it the binary treatment later
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