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MovieOcean: Assessment of a Personality-based Recommender System

: This research effort explores the incorporation of personality treats into user-user collaborative ﬁltering algorithms. To explore the performance of such a method, MovieOcean, a movie recommender system that uses a questionnaire based on the Big Five model to generate personality proﬁles, was implemented. These personality proﬁles are used to precompute personality-based neighborhoods, which are then used to predict movie ratings and generate recommendations. In an ofﬂine analysis, the root mean square error metric is computed to analyze the accuracy of the predicted ratings and the F1-score to assess the relevance of the recommendations for the personality-based and a standard-rating-based approach. The obtained results showed that the root mean square error of the personality-based recommender system improves when the personality has a higher weight than the information about the user ratings. A subsequent t-test was conducted for the proposed personality-based approach underperformed based on the root mean square error metric. Furthermore, interviews with users suggested that including aspects of personality when computing recommendations is well-perceived and can indeed help improve current recommendation methods.