A new similarity measure for collaborative filtering to alleviate the new user cold-starting problem

Authors:
Hyung Jun Ahn
Affiliations:
Department of Management Systems, Waikato Management School, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand
Venue:
Information Sciences: an International Journal
Year:
2008

Citing 25
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Abstract

Collaborative filtering is one of the most successful and widely used methods of automated product recommendation in online stores. The most critical component of the method is the mechanism of finding similarities among users using product ratings data so that products can be recommended based on the similarities. The calculation of similarities has relied on traditional distance and vector similarity measures such as Pearson's correlation and cosine which, however, have been seldom questioned in terms of their effectiveness in the recommendation problem domain. This paper presents a new heuristic similarity measure that focuses on improving recommendation performance under cold-start conditions where only a small number of ratings are available for similarity calculation for each user. Experiments using three different datasets show the superiority of the measure in new user cold-start conditions.