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ACM Transactions on Information Systems (TOIS)
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A Comparison of Collaborative-Filtering Recommendation Algorithms for E-commerce
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Fuzzy-genetic approach to recommender systems based on a novel hybrid user model
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Evaluation of recommender systems: A new approach
Expert Systems with Applications: An International Journal
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Collaborative filtering adapted to recommender systems of e-learning
Knowledge-Based Systems
Collaborative filtering recommender systems
The adaptive web
A new collaborative filtering metric that improves the behavior of recommender systems
Knowledge-Based Systems
Empirical analysis of predictive algorithms for collaborative filtering
UAI'98 Proceedings of the Fourteenth conference on Uncertainty in artificial intelligence
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Recommender systems are highly sensitive to cases of false-positives, that is, recommendations made which have proved not to be relevant. These situations often lead to a loss of trust in the system by the users; therefore, every improvement in the recommendation quality measures is important. Recommender systems which admit an extensive set of values in the votes (usually those which admit more than 5 stars to rate an item) cannot be assessed adequately using precision as a recommendation quality measure; this is due to the fact that the division of the possible values of the votes into just two sets, relevant (true-positive) and not-relevant (false-positive), proves to be too poor and involves the accumulation of values in the not-relevant set. In order to establish a balanced quality measure it is necessary to have access to detailed information on how the cases of false-positives are distributed. This paper provides the mathematical formalism which defines the precision quality measure in recommender systems and its generalization to extended-precision.