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Sentiment Analysis and Opinion Mining by Bing Liu

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CHAPTER 8

Analysis of Comparative Opinions

Apart from directly expressing positive or negative opinions about an entity and its aspects, one can also express opinions by comparing similar entities. Such opinions are called comparative opinions (Jindal and Liu, 2006a, 2006b). Comparative opinions are related to but are also different from regular opinions. They not only have different semantic meanings but also have different syntactic forms. For example, a typical regular opinion sentence is “The voice quality of this phone is amazing,” and a typical comparative opinion sentence is “The voice quality of Nokia phones is better than that of iPhones.” This comparative sentence does not say that any phone's voice quality is good or bad, but simply ...

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