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Ben", "lastName": "Schafer" }, { "creatorType": "author", "firstName": "Joseph A", "lastName": "Konstan" }, { "creatorType": "author", "firstName": "John", "lastName": "Riedl" } ], "abstractNote": "i>Recommender systems are being used by an ever-increasing number of E-commerce sites to help consumers find products to purchase. What started as a novelty has turned into a serious business tool. Recommender systems use product knowledge—either hand-coded knowledge provided by experts or “mined” knowledge learned from the behavior of consumers—to guide consumers through the often-overwhelming task of locating products they will like. In this article we present an explanation of how recommender systems are related to some traditional database analysis techniques. We examine how recommender systems help E-commerce sites increase sales and analyze the recommender systems at six market-leading sites. Based on these examples, we create a taxonomy of recommender systems, including the inputs required from the consumers, the additional knowledge required from the database, the ways the recommendations are presented to consumers, the technologies used to create the recommendations, and the level of personalization of the recommendations. We identify five commonly used E-commerce recommender application models, describe several open research problems in the field of recommender systems, and examine privacy implications of recommender systems technology.", "publicationTitle": "Data Min. Knowl. Discov.", "publisher": "", "place": "", "date": "January 2001", "volume": "5", "issue": "1-2", "section": "", "partNumber": "", "partTitle": "", "pages": "115–153", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "10.1023/A:1009804230409", "citationKey": "", "url": "http://portal.acm.org/citation.cfm?id=593429.593510", "accessDate": "2011-07-25T17:30:17Z", "PMID": "", "PMCID": "", "ISSN": "1384-5810", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "ACM Digital Library", "callNumber": "", "rights": "", "extra": "ACM ID: 593510", "tags": [ { "tag": "commercial services", "type": 1 }, { "tag": "cross-sell", "type": 1 }, { "tag": "customer loyalty", "type": 1 }, { "tag": "data mining", "type": 1 }, { "tag": "database marketing", "type": 1 }, { "tag": "electronic commerce", "type": 1 }, { "tag": "evaluation/methodology", "type": 1 }, { "tag": "experimentation", "type": 1 }, { "tag": "human factors", "type": 1 }, { "tag": "mass customization", "type": 1 }, { "tag": "measurement", "type": 1 }, { "tag": "performance", "type": 1 }, { "tag": "personalization", "type": 1 }, { "tag": "privacy", "type": 1 }, { "tag": "recommender systems", "type": 1 }, { "tag": "up-sell", "type": 1 }, { "tag": "user interface", "type": 1 }, { "tag": "user profiles and alert services", "type": 1 } ], "collections": [ "F75EKCHI" ], "relations": {}, "dateAdded": "2011-11-27T16:32:42Z", "dateModified": "2011-11-27T16:32:42Z" } }, { "key": "FTTJIS6K", "version": 1, "library": { "type": "group", "id": 12585, "name": "COALESCE", "links": { "alternate": { "href": "https://www.zotero.org/groups/coalesce", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/12585/items/FTTJIS6K", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coalesce/items/FTTJIS6K", "type": "text/html" } }, "meta": { "createdByUser": { "id": 147725, "username": "nuno.bett", "name": "Nuno Bettencourt", "links": { "alternate": { "href": "https://www.zotero.org/nuno.bett", "type": "text/html" } } }, "creatorSummary": "Linden et al.", "parsedDate": "2003-02", "numChildren": 1 }, "data": { "key": "FTTJIS6K", "version": 1, "itemType": "journalArticle", "title": "Amazon.com recommendations: item-to-item collaborative filtering", "creators": [ { "creatorType": "author", "firstName": "G.", "lastName": "Linden" }, { "creatorType": "author", "firstName": "B.", "lastName": "Smith" }, { "creatorType": "author", "firstName": "J.", "lastName": "York" } ], "abstractNote": "Recommendation algorithms are best known for their use on e-commerce Web sites, where they use input about a customer's interests to generate a list of recommended items. Many applications use only the items that customers purchase and explicitly rate to represent their interests, but they can also use other attributes, including items viewed, demographic data, subject interests, and favorite artists. At Amazon.com, we use recommendation algorithms to personalize the online store for each customer. The store radically changes based on customer interests, showing programming titles to a software engineer and baby toys to a new mother. There are three common approaches to solving the recommendation problem: traditional collaborative filtering, cluster models, and search-based methods. Here, we compare these methods with our algorithm, which we call item-to-item collaborative 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 algorithm produces recommendations in real-time, scales to massive data sets, and generates high quality recommendations.", "publicationTitle": "IEEE Internet Computing", "publisher": "", "place": "", "date": "Jan/Feb 2003", "volume": "7", "issue": "1", "section": "", "partNumber": "", "partTitle": "", "pages": "76- 80", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "10.1109/MIC.2003.1167344", "citationKey": "", "url": "", "accessDate": "", "PMID": "", "PMCID": "", "ISSN": "1089-7801", "archive": "", "archiveLocation": "", "shortTitle": "Amazon.com recommendations", "language": "English", "libraryCatalog": "IEEE Xplore", "callNumber": "", "rights": "", "extra": "", "tags": [ { "tag": "Advertising", "type": 1 }, { "tag": "Aggregates", "type": 1 }, { "tag": "Amazon.com recommendations", "type": 1 }, { "tag": "Clustering algorithms", "type": 1 }, { "tag": "Collaboration", "type": 1 }, { "tag": "Demography", "type": 1 }, { "tag": "Filtering algorithms", "type": 1 }, { "tag": "Pediatrics", "type": 1 }, { "tag": "Web sites", "type": 1 }, { "tag": "cluster models", "type": 1 }, { "tag": "customer interests", "type": 1 }, { "tag": "demographic data", "type": 1 }, { "tag": "e-commerce", "type": 1 }, { "tag": "electronic commerce", "type": 1 }, { "tag": "electronic mail", "type": 1 }, { "tag": "information filtering", "type": 1 }, { "tag": "information filters", "type": 1 }, { "tag": "information retrieval", "type": 1 }, { "tag": "item-to-item collaborative filtering", "type": 1 }, { "tag": "massive data sets", "type": 1 }, { "tag": "online store", "type": 1 }, { "tag": "product catalog", "type": 1 }, { "tag": "real-time", "type": 1 }, { "tag": "real-time systems", "type": 1 }, { "tag": "recommendation algorithms", "type": 1 }, { "tag": "retail data processing", "type": 1 }, { "tag": "search-based methods", "type": 1 } ], "collections": [ "F75EKCHI" ], "relations": {}, "dateAdded": "2011-11-27T16:32:29Z", "dateModified": "2011-11-27T16:32:29Z" } }, { "key": "CM9M93A4", "version": 1, "library": { "type": "group", "id": 12585, "name": "COALESCE", "links": { "alternate": { "href": "https://www.zotero.org/groups/coalesce", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/12585/items/CM9M93A4", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coalesce/items/CM9M93A4", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/12585/items/J89RSP6F", "type": "application/json" } }, "meta": { "createdByUser": { "id": 147725, "username": "nuno.bett", "name": "Nuno Bettencourt", "links": { "alternate": { "href": "https://www.zotero.org/nuno.bett", "type": "text/html" } } } }, "data": { "key": "CM9M93A4", "version": 1, "parentItem": "J89RSP6F", "itemType": "attachment", "linkMode": "linked_url", "title": "Amazon.com Link", "accessDate": "2011-05-30T10:48:30Z", "url": "http://www.amazon.com/dp/0387858199", "note": "", "contentType": "text/html", "charset": "", "tags": [], "relations": {}, "dateAdded": "2011-11-27T16:32:17Z", "dateModified": "2011-11-27T16:32:17Z" } }, { "key": "J89RSP6F", "version": 1, "library": { "type": "group", "id": 12585, "name": "COALESCE", "links": { "alternate": { "href": "https://www.zotero.org/groups/coalesce", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/12585/items/J89RSP6F", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coalesce/items/J89RSP6F", "type": "text/html" } }, "meta": { "createdByUser": { "id": 147725, "username": "nuno.bett", "name": "Nuno Bettencourt", "links": { "alternate": { "href": "https://www.zotero.org/nuno.bett", "type": "text/html" } } }, "creatorSummary": "Ricci et al.", "parsedDate": "2010-10-28", "numChildren": 1 }, "data": { "key": "J89RSP6F", "version": 1, "itemType": "book", "title": "Recommender Systems Handbook", "creators": [ { "creatorType": "author", "firstName": "Francesco", "lastName": "Ricci" }, { "creatorType": "author", "firstName": "Lior", "lastName": "Rokach" }, { "creatorType": "author", "firstName": "Bracha", "lastName": "Shapira" }, { "creatorType": "author", "firstName": "Paul B.", "lastName": "Kantor" } ], "abstractNote": "", "series": "", "seriesNumber": "", "volume": "", "numberOfVolumes": "", "edition": "1st Edition.", "date": "2010-10-28", "publisher": "Springer", "place": "", "originalDate": "", "originalPublisher": "", "originalPlace": "", "format": "", "numPages": "", "ISBN": "0387858199", "DOI": "", "citationKey": "", "url": "", "accessDate": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "Amazon.com", "callNumber": "", "rights": "", "extra": "", "tags": [], "collections": [ "F75EKCHI" ], "relations": {}, "dateAdded": "2011-11-27T16:32:17Z", "dateModified": "2011-11-27T16:32:17Z" } }, { "key": "IEHIHEIB", "version": 1, "library": { "type": "group", "id": 12585, "name": "COALESCE", "links": { "alternate": { "href": "https://www.zotero.org/groups/coalesce", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/12585/items/IEHIHEIB", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coalesce/items/IEHIHEIB", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/12585/items/KSRRD8KS", "type": "application/json" } }, "meta": { "createdByUser": { "id": 147725, "username": "nuno.bett", "name": "Nuno Bettencourt", "links": { "alternate": { "href": "https://www.zotero.org/nuno.bett", "type": "text/html" } } } }, "data": { "key": "IEHIHEIB", "version": 1, "parentItem": "KSRRD8KS", "itemType": "attachment", "linkMode": "imported_url", "title": "ACM Snapshot", "accessDate": "2011-04-29T10:20:20Z", "url": "http://portal.acm.org/citation.cfm?id=245121", "note": "", "contentType": "text/html", "charset": "utf-8", "filename": "citation.html", "md5": null, "mtime": 1322411469000, "tags": [], "relations": {}, "dateAdded": "2011-11-27T16:31:09Z", "dateModified": "2011-11-27T16:31:39Z" } }, { "key": "IT9I7DW8", "version": 1, "library": { "type": "group", "id": 12585, "name": "COALESCE", "links": { "alternate": { "href": "https://www.zotero.org/groups/coalesce", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/12585/items/IT9I7DW8", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coalesce/items/IT9I7DW8", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/12585/items/KSRRD8KS", "type": "application/json" } }, "meta": { "createdByUser": { "id": 147725, "username": "nuno.bett", "name": "Nuno Bettencourt", "links": { "alternate": { "href": "https://www.zotero.org/nuno.bett", "type": "text/html" } } }, "numChildren": 0 }, "data": { "key": "IT9I7DW8", "version": 1, "parentItem": "KSRRD8KS", "itemType": "attachment", "linkMode": "imported_url", "title": "ACM Full Text PDF", "accessDate": "2011-04-29T10:20:30Z", "url": "http://portal.acm.org/ft_gateway.cfm?id=245121&type=pdf&CFID=18456647&CFTOKEN=63028920", "note": "", "contentType": "application/pdf", "charset": "", "filename": "Resnick e Varian - 1997 - Recommender systems.pdf", "md5": "90f5844f80e67af7483255e79d3d6b38", "mtime": 1322411469000, "tags": [], "relations": {}, "dateAdded": "2011-11-27T16:31:09Z", "dateModified": "2011-11-27T16:31:39Z" } }, { "key": "KSRRD8KS", "version": 1, "library": { "type": "group", "id": 12585, "name": "COALESCE", "links": { "alternate": { "href": "https://www.zotero.org/groups/coalesce", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/12585/items/KSRRD8KS", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coalesce/items/KSRRD8KS", "type": "text/html" } }, "meta": { "createdByUser": { "id": 147725, "username": "nuno.bett", "name": "Nuno Bettencourt", "links": { "alternate": { "href": "https://www.zotero.org/nuno.bett", "type": "text/html" } } }, "creatorSummary": "Resnick and Varian", "parsedDate": "1997-03", "numChildren": 2 }, "data": { "key": "KSRRD8KS", "version": 1, "itemType": "journalArticle", "title": "Recommender systems", "creators": [ { "creatorType": "author", "firstName": "Paul", "lastName": "Resnick" }, { "creatorType": "author", "firstName": "Hal R", "lastName": "Varian" } ], "abstractNote": "Paul Resnick\n\t\n\thomepage\n\t\n\tpresnickumich.edu\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\t\n\t\n\t\n\t\n\t\n\t\n\n\n\n\n\n \n\n\n\n\tBibliometrics: publication history\n\t\t\n \n\t\t\t\n\t\t\t\tPublication years1989-2010\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tPublication count42\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tCitation Count1,669\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tAvailable for download31\n\t\t\t\n\t\t\t\n \t\t\t\n\t\t\t\n\t\t\t\tDownloads (6 Weeks)701\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tDownloads (12 Months)6,065\n\t\t\t\n\t\t\t\n \t\t\t\n\t\t\n\t\n\t\n\n\n\n \n \n View colleagues of Paul Resnick\n \n \n \n \n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\n \n \n \n \n\n\n\n\n\t\n\t\t\n\t\t\t\n\t\t\n\t\n\n\n\t Hal R. Varian\n\t\n\t\n\t\n\tNo contact information provided yet.\n\t\n\t\n\t\t\t\n\t\n\t\n\t\n\t\n\t\n\n\n\n\n\n \n\n\n\n\tBibliometrics: publication history\n\t\t\n \n\t\t\t\n\t\t\t\tPublication years1992-2009\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tPublication count21\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tCitation Count792\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tAvailable for download6\n\t\t\t\n\t\t\t\n \t\t\t\n\t\t\t\n\t\t\t\tDownloads (6 Weeks)243\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tDownloads (12 Months)1,926\n\t\t\t\n\t\t\t\n \t\t\t\n\t\t\n\t\n\t\n\n\n\n \n \n View colleagues of Hal R. Varian", "publicationTitle": "Communications of the ACM", "publisher": "", "place": "", "date": "March 1997", "volume": "40", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "56–58", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "Commun. ACM", "DOI": "10.1145/245108.245121", "citationKey": "", "url": "", "accessDate": "", "PMID": "", "PMCID": "", "ISSN": "0001-0782", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "ACM Digital Library", "callNumber": "", "rights": "", "extra": "ACM ID: 245121", "tags": [ { "tag": "applications and expert systems", "type": 1 }, { "tag": "design", "type": 1 }, { "tag": "documentation", "type": 1 }, { "tag": "user/machine systems", "type": 1 } ], "collections": [ "F75EKCHI" ], "relations": {}, "dateAdded": "2011-11-27T16:31:09Z", "dateModified": "2011-11-27T16:31:09Z" } }, { "key": "GEGHVU4S", "version": 1, "library": { "type": "group", "id": 12585, "name": "COALESCE", "links": { "alternate": { "href": "https://www.zotero.org/groups/coalesce", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/12585/items/GEGHVU4S", "type": "application/json" }, "alternate": { "href": 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"utf-8", "filename": "p210-shardanand.html", "md5": null, "mtime": 1322411371000, "tags": [], "relations": {}, "dateAdded": "2011-11-27T16:29:30Z", "dateModified": "2011-11-27T16:30:07Z" } }, { "key": "59PG9EFQ", "version": 1, "library": { "type": "group", "id": 12585, "name": "COALESCE", "links": { "alternate": { "href": "https://www.zotero.org/groups/coalesce", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/12585/items/59PG9EFQ", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coalesce/items/59PG9EFQ", "type": "text/html" } }, "meta": { "createdByUser": { "id": 147725, "username": "nuno.bett", "name": "Nuno Bettencourt", "links": { "alternate": { "href": "https://www.zotero.org/nuno.bett", "type": "text/html" } } }, "creatorSummary": "Shardanand and Maes", "parsedDate": "1995", "numChildren": 2 }, "data": { "key": "59PG9EFQ", "version": 1, "itemType": "journalArticle", "title": "Social information filtering: 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information provided yet.\n\t\n\t\n\t\t\t\n\t\n\t\n\t\n\t\n\t\n\n\n\n\n\n \n\n\n\n\tBibliometrics: publication history\n\t\t\n \n\t\t\t\n\t\t\t\tPublication years1987-2010\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tPublication count88\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tCitation Count2,764\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tAvailable for download41\n\t\t\t\n\t\t\t\n \t\t\t\n\t\t\t\n\t\t\t\tDownloads (6 Weeks)792\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\tDownloads (12 Months)7,293\n\t\t\t\n\t\t\t\n \t\t\t\n\t\t\n\t\n\t\n\n\n\n \n \n View colleagues of Pattie Maes", "publicationTitle": "Proceedings of the SIGCHI conference on Human factors in computing systems", "publisher": "", "place": "", "date": "1995", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "210–217", "series": "CHI '95", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "http://dx.doi.org/10.1145/223904.223931", "citationKey": "", "url": "http://dx.doi.org/10.1145/223904.223931", 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