Industry Report Amazon.com Recommendations - UMD

Industry Report76 JANUARY FEBRUARY 2003 Published by the IEEE Computer Society1089-7801/03/$ 2003 IEEEIEEE INTERNET Item-to-Item collaborative FilteringRecommendation algorithms are bestknown for their use on e-commerce Websites,1where they use input about a cus-tomer s interests to generate a list of recommend-ed items. Many applications use only the itemsthat customers purchase and explicitly rate to rep-resent their interests, but they can also use otherattributes, including items viewed, demographicdata, subject interests, and favorite artists. At , we use recommendation algo-rithms to personalize the online store for each cus-tomer. The store radically changes based on cus-tomer interests, showing programming titles to asoftware engineer and baby toys to a new click-through and conversion rates twoimportant measures of Web-based and emailadvertising effectiveness vastly exceed those ofuntargeted content such as banner advertisementsand top-seller lists.

tive filtering, cluster models, and search-based methods. Here, we compare these methods with our algorithm, which we call item-to-item collab-orative filtering. Unlike traditional collaborative filtering, our algorithm’s online computation scales independently of the number of customers and number of items in the product catalog. Our algo-

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  Collaborative, Filtering, Revatio, Collab, Collaborative filtering, Col laborative filtering

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