Abstract
In recent years, a large body of literature has accumulated around the topic of research paper recommender systems. However, since most studies have focused on the variable of accuracy, they have overlooked the serendipity of recommendations, which is an important determinant of user satisfaction. Serendipity is concerned with the relevance and unexpectedness of recommendations, and so serendipitous items are considered those which positively surprise users. The purpose of this article was to examine two key research questions: firstly, whether a user’s Tweets can assist in generating more serendipitous recommendations; and secondly, whether the diversification of a list of recommended items further improves serendipity. To investigate these issues, an online experiment was conducted in the domain of computer science with 22 subjects. As an evaluation metric, we use the serendipity score (SRDP), in which the unexpectedness of recommendations is inferred by using a primitive recommendation strategy. The results indicate that a user’s Tweets do not improve serendipity, but they can reflect recent research interests and are typically heterogeneous. Contrastingly, diversification was found to lead to a greater number of serendipitous research paper recommendations.
Highlights
To help researchers overcome the problem of information overload, various studies have developed recommender systems (Beel et al, 2016; Bai et al, 2019)
Several studies on recommender systems conducted in other domains have drawn attention to the fact that there are important aspects other than accuracy (McNee, Riedl & Konstan, 2006; Herlocker et al, 2004; Kotkov, Wang & Veijalainen, 2016; Kotkov, Veijalainen & Wang, 2018)
We study a research paper recommender system focusing on serendipity
Summary
To help researchers overcome the problem of information overload, various studies have developed recommender systems (Beel et al, 2016; Bai et al, 2019). Several studies on recommender systems conducted in other domains (e.g. movies) have drawn attention to the fact that there are important aspects other than accuracy (McNee, Riedl & Konstan, 2006; Herlocker et al, 2004; Kotkov, Wang & Veijalainen, 2016; Kotkov, Veijalainen & Wang, 2018). One of these aspects is serendipity, which is concerned with the unexpectedness of recommendations and the. A survey by Uchiyama et al (2011) revealed that researchers think that it is important for them to be recommended serendipitous research papers
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