{"id":554,"date":"2011-03-12T12:59:16","date_gmt":"2011-03-12T12:59:16","guid":{"rendered":"http:\/\/blog.soton.ac.uk\/shopster\/?p=554"},"modified":"2011-05-26T12:59:37","modified_gmt":"2011-05-26T12:59:37","slug":"trust-aware-recommender-systems","status":"publish","type":"post","link":"https:\/\/blog.soton.ac.uk\/shopster\/trust-aware-recommender-systems\/","title":{"rendered":"Trust-aware Recommender Systems"},"content":{"rendered":"<p>This article presents 3 weaknesses for Collaborative Filterings (CF) algorithms. These are: <strong>data sparsity<\/strong> (difficult to calculate user similarity because of very few commonly rated items), <strong>cold-start<\/strong> users (new users with no ratings &#8211; or no friends in our case) and <strong>malicious users<\/strong> attacking Recommender Systems (e.g. by copy-profile attack). They conduct experiments using a large (real) database from a website and prove that having a trust metric between users is much more accurate than common CF algorithms. We do not necessarily have to include a trust value for every relationship in Shopster but we can incorporate trust as a measure of how trustworthy a user is, based on their divergence from actual average ratings but also on how helpful their posts and comments (if any)\u00a0are rated by other users.<\/p>\n<p>Source: <a href=\"http:\/\/citeseerx.ist.psu.edu\/viewdoc\/download?doi=10.1.1.106.305&amp;rep=rep1&amp;type=pdf\" target=\"_blank\">Trust-aware Recommender Systems<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article presents 3 weaknesses for Collaborative Filterings (CF) algorithms. These are: data sparsity (difficult to calculate user similarity because of very few commonly rated items), cold-start users (new users with no ratings &#8211; or no friends in our case) and malicious users attacking Recommender Systems (e.g. by copy-profile attack). They conduct experiments using a [&hellip;]<\/p>\n","protected":false},"author":160,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5895],"tags":[],"class_list":["post-554","post","type-post","status-publish","format-standard","hentry","category-related-articles"],"_links":{"self":[{"href":"https:\/\/blog.soton.ac.uk\/shopster\/wp-json\/wp\/v2\/posts\/554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.soton.ac.uk\/shopster\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.soton.ac.uk\/shopster\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/shopster\/wp-json\/wp\/v2\/users\/160"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/shopster\/wp-json\/wp\/v2\/comments?post=554"}],"version-history":[{"count":2,"href":"https:\/\/blog.soton.ac.uk\/shopster\/wp-json\/wp\/v2\/posts\/554\/revisions"}],"predecessor-version":[{"id":556,"href":"https:\/\/blog.soton.ac.uk\/shopster\/wp-json\/wp\/v2\/posts\/554\/revisions\/556"}],"wp:attachment":[{"href":"https:\/\/blog.soton.ac.uk\/shopster\/wp-json\/wp\/v2\/media?parent=554"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/shopster\/wp-json\/wp\/v2\/categories?post=554"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/shopster\/wp-json\/wp\/v2\/tags?post=554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}