TAILIEUCHUNG - Báo cáo khoa học: "Identifying Noun Product Features that Imply Opinions"

Identifying domain-dependent opinion words is a key problem in opinion mining and has been studied by several researchers. However, existing work has been focused on adjectives and to some extent verbs. Limited work has been done on nouns and noun phrases. In our work, we used the feature-based opinion mining model, and we found that in some domains nouns and noun phrases that indicate product features may also imply opinions. | Identifying Noun Product Features that Imply Opinions Lei Zhang University of Illinois at Chicago 851 sOuth Morgan Street Chicago IL 60607 USA lzhang3@ Bing Liu University of Illinois at Chicago 851 South Morgan Street Chicago IL 60607 USA liub@ Abstract Identifying domain-dependent opinion words is a key problem in opinion mining and has been studied by several researchers. However existing work has been focused on adjectives and to some extent verbs. Limited work has been done on nouns and noun phrases. In our work we used the feature-based opinion mining model and we found that in some domains nouns and noun phrases that indicate product features may also imply opinions. In many such cases these nouns are not subjective but objective. Their involved sentences are also objective sentences and imply positive or negative opinions. Identifying such nouns and noun phrases and their polarities is very challenging but critical for effective opinion mining in these domains. To the best of our knowledge this problem has not been studied in the literature. This paper proposes a method to deal with the problem. Experimental results based on real-life datasets show promising results. 1 Introduction Opinion words are words that convey positive or negative polarities. They are critical for opinion mining Pang et al. 2002 Turney 2002 Hu and Liu 2004 Wilson et al. 2004 Popescu and Etzioni 2005 Gamon et al. 2005 Ku et al. 2006 Breck et al. 2007 Kobayashi et al. 2007 Ding et al. 2008 Titov and McDonald 2008 Pang and 575 Lee 2008 Lu et al. 2009 . The key difficulty in finding such words is that opinions expressed by many of them are domain or context dependent. Several researchers have studied the problem of finding opinion words Liu 2010 . The approaches can be grouped into corpus-based approaches Hatzivassiloglou and McKeown 1997 Wiebe 2000 Kanayama and Nasukawa 2006 Qiu et al. 2009 and dictionary-based approaches Hu and Liu 2004 Kim and Hovy 2004 Kamps et .

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