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WIREs Data Mining Knowl Discov
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From existing trends to future trends in privacy‐preserving collaborative filtering

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The information overload problem, also known as infobesity, forces online vendors to utilize collaborative filtering algorithms. Although various recommendation methods are widely used by many electronic commerce sites, they still have substantial problems, including but not limited to privacy, accuracy, online performance, scalability, cold start, coverage, grey sheep, robustness, being subject to shilling attacks, diversity, data sparsity, and synonymy. Privacy‐preserving collaborative filtering methods have been proposed to handle the privacy problem. Due to the increasing popularity of privacy protection and recommendation estimation over the Internet, prediction schemes with privacy are still receiving increasing attention. Because research trends might change over time, it is critical for researchers to observe future trends. In this study, we determine the existing trends in the privacy‐preserving collaborative filtering field by examining the related papers published mainly in the last few years. Comprehensive examinations of the most up‐to‐date related studies are described. By scrutinizing the contemporary inclinations, we present the most promising possible research trends in the near future. Our proposals can help interested researchers direct their research toward better outcomes and might open new ways to enrich privacy‐preserving collaborative filtering studies. WIREs Data Mining Knowl Discov 2015, 5:276–291. doi: 10.1002/widm.1163 This article is categorized under: Technologies > Prediction
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