Analyzing Potential of Personal Values-Based User Modeling for Long Tail Item Recommendation

Abstract

This paper examines the potential of personal values-based user modeling for long tail item recommendation. Long tail items are defined as those which are not popular but are preferred by small numbers of specific users. Although recommending long tail items to relevant users is beneficial for both the providers and consumers of such items, it is known to be a challenge for most recommendation algorithms. In particular, a long tail item is one that would be purchased and/or rated by a small number of users, so it is difficult to predict its rating accurately. This paper assumes that the influence of personal values becomes more obvious when users evaluate long tail items, and examines it through offline experiment. The Rating Matching Rate (RMRate) has been proposed in order to incorporate users’ personal values into recommender systems. As the RMRate models personal values as the weight of an item’s attribute, it is easy to incorporate into existing recommendation algorithms. An experiment was conducted to evaluate the performance of long tail item recommendation; Experimental result shows that personal values-based user modeling can recommend less popular items while maintaining precision.

A Survey of Long‐Tail Item Recommendation Methods

“…Other Long-Tail Item Recommendation Methods. In addition to the above-mentioned long-tail item recommendation methods, researchers have also adopted the ranking method [25], linear-model-based method [27], relevance model-based methods [37], user value-based method [38], and multilevel item similarity calculation method [39].…”

“…Takama et al [38] proposed a long-tail item recommendation method based on personal values. Personal values are an important factor affecting users' purchases.…”