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Collaborative Filtering: The Aim of Recommender Systems and the Significance of User Ratings

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Redpath, Jennifer, Glass, David, McClean, Sally and Chen, Luke (2010) Collaborative Filtering: The Aim of Recommender Systems and the Significance of User Ratings. In: Advances in Information Retrieval. Springer Berlin / Heidelberg, pp. 394-406. ISBN 978-3-642-12274-3 [Book section]

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URL: http://dx.doi.org/10.1007/978-3-642-12275-0_35

DOI: doi:10.1007/978-3-642-12275-0_35

Abstract

This paper investigates the significance of numeric user ratings in recommender systems by considering their inclusion / exclusion in both the generation and evaluation of recommendations. When standard evaluation metrics are used, experimental results show that inclusion of numeric rating values in the recommendation process does not enhance the results. However, evaluating the accuracy of a recommender algorithm requires identifying the aim of the system. Evaluation metrics such as precision and recall evaluate how well a system performs at recommending items that have been previously rated by the user. By contrast, a new metric, known as Approval Rate, is intended to evaluate how well a system performs at recommending items that would be rated highly by the user. Experimental results demonstrate that these two aims are not synonymous and that for an algorithm to attempt both obscures the investigation. The results also show that appropriate use of numeric rating valuesin the process of calculating user similarity can enhance the performance when Approval Rate is used.

Item Type:Book section
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Computing and Information Engineering
Faculty of Computing & Engineering > School of Computing and Mathematics
Research Institutes and Groups:Computer Science Research Institute
Computer Science Research Institute > Artificial Intelligence and Applications
Computer Science Research Institute > Information and Communication Engineering
Computer Science Research Institute > Smart Environments
ID Code:14604
Deposited By:Professor Sally McClean
Deposited On:11 Aug 2010 15:41
Last Modified:11 Aug 2010 15:41

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