MovieLense {recommenderlab}

MovieLense Dataset (100k)

Description

The 100k MovieLense ratings data set. The data was collected through the MovieLens web site (movielens.umn.edu) during the seven-month period from September 19th, 1997 through April 22nd, 1998. The data set contains about 100,000 ratings (1-5) from 943 users on 1664 movies. Movie and user metadata is also provided in MovieLenseMeta and MovieLenseUser.

Usage

data(MovieLense)

Format

The format of MovieLense is an object of class "realRatingMatrix"

The format of MovieLenseMeta is a data.frame with movie title, year, IMDb URL and indicator variables for 19 genres.

The format of MovieLenseUser is a data.frame with user age, sex, occupation and zip code.

Source

GroupLens Research, https://grouplens.org/datasets/movielens/

References

Herlocker, J., Konstan, J., Borchers, A., Riedl, J.. An Algorithmic Framework for Performing Collaborative Filtering. Proceedings of the 1999 Conference on Research and Development in Information Retrieval. Aug. 1999.

Examples

data(MovieLense)
MovieLense

## look at the first few ratings of the first user
head(as(MovieLense[1,], "list")[[1]])

## visualize part of the matrix
image(MovieLense[1:100,1:100])

## number of ratings per user
hist(rowCounts(MovieLense))

## number of ratings per movie
hist(colCounts(MovieLense))

## mean rating (averaged over users)
mean(rowMeans(MovieLense))

## available movie meta information
head(MovieLenseMeta)

## available user meta information
head(MovieLenseUser)