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

Date

2010-03

Advisors

Journal Title

Journal ISSN

ISSN

Volume Title

Publisher

Springer

Type

Book chapter

Peer reviewed

Yes

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.

Description

Keywords

Recommender Systems, Collaborative Filtering, Information Retrieval

Citation

Redpath, J., Glass, D.H., McClean, S., Chen, L. (2010) Collaborative Filtering: The Aim of Recommender Systems and the Significance of User Ratings. In: Gurrin, C. et al. (eds) Advances in Information Retrieval. ECIR 2010. Lecture Notes in Computer Science, 5993, Berlin: Springer. pp.394-406

Rights

Research Institute

Cyber Technology Institute (CTI)