An algorithmic framework for performing collaborative filtering
Proceedings of the 22nd annual international ACM SIGIR conference on Research and development in information retrieval
Evaluating collaborative filtering recommender systems
ACM Transactions on Information Systems (TOIS)
Unifying user-based and item-based collaborative filtering approaches by similarity fusion
SIGIR '06 Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval
Empirical analysis of predictive algorithms for collaborative filtering
UAI'98 Proceedings of the Fourteenth conference on Uncertainty in artificial intelligence
A new criteria for selecting neighborhood in memory-based recommender systems
CAEPIA'11 Proceedings of the 14th international conference on Advances in artificial intelligence: spanish association for artificial intelligence
Using past-prediction accuracy in recommender systems
Information Sciences: an International Journal
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The Movielens dataset and the Herlocker et al. study of 1999 have been very influential in collaborative filtering. Yet, the age of both invites re-examining their applicability. We use Netflix challenge data to re-visit the prior results. In particular, we re-evaluate the parameters of Herlocker et al.'s method on two critical factors: measuring similarity between users and normalizing the ratings of the users. We find that normalization plays a significant role and that Pearson Correlation is not necessarily the best similarity metric.