opinion mining tutorial-WWW-2008 [Compatibility Mode]

?????????TTu utorialtorial given aat t WWW-2008, April 21, 2008 in BeijingOpinion MMiningining & Summarization- Sentiment AnalysisBing LiuDepartment of Computer ScienceUniversity of Illinois at Chicagoliub@cs.uic.eduhttp://www.cscs.uicuic.edu/~liubIntroduction – facts and opinionsTwo main types of textual information. FtFacts and OpinionsMost current information processing technique (e.g., ssearchearch engines) wworkork with factsfacts (assume they are true)Facts cancan be expressed wwithith topictopic keywords.keywords.E.g., search engines do not search for opinionsOpppinions are hard to express with a few keywordsHow do people think of Motorola Cell phones?Current search ranking strategy is not appropriate for opinion retrieval/search.Bing Liu, UIC WWW-2008 Tutorial 2??????????????????Introduction – user generated contentWord-of-mouth on the WebOne can express personal experiences and opinions on almost anything, at review sites, forums, discussion groups, blogs ... (called tthehe user generated content.)They contain valuable informationWeb/global scale: No longer – one’s circle of friendsOur interest: to mine opinions expressed in the user-generated contentAn intellectually very challenging problem.Practically very useful. Bing Liu, UIC WWW-2008 Tutorial 3Introduction – ApplicationsBusinesses and organizations ...