hyper2 (version 3.0-0)

jester: Jester dataset

Description

A likelihood function for the Jester datasets

Usage

data(jester)

Details

Object jester is a likelihood function for the 91 jokes rated by the first 150 respondents in file jester_dataset_1_3.zip, taken from Goldberg et al. Object jester_maxp is the result of running maxp(jester).

Objects jester and jester_maxp can be generated by running script inst/jester.Rmd, which includes some further technical documentation. This file takes about 10 minutes to run.

The dataset is interesting because it has been analysed by many workers, including Goldberg, for patterns; here I assume that all the respondents behave identically (but randomly). It is included here because it is a very severe numerical challenge in the context of the hyper2 package. I am not convinced that maxjest is even close to the true evaluate.

References

Eigentaste: A Constant Time Collaborative Filtering Algorithm. Ken Goldberg, Theresa Roeder, Dhruv Gupta, and Chris Perkins. Information Retrieval, 4(2), 133-151. July 2001.

Examples

data(jester)
# maxp(jester)  # takes too long

loglik(indep(jester_maxp),jester)