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Sentiment Analysis and Opinion Mining by Bing Liu

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CHAPTER 4

Sentence Subjectivity and Sentiment Classification

As discussed in the previous chapter, document-level sentiment classification may be too crude for most applications. We now move to the sentence level, i.e., to classify sentiment expressed in each sentence. However, there is no fundamental difference between document and sentence-level classifications because sentences are just short documents. One assumption that researchers often make about sentence-level analysis is that a sentence usually contains a single opinion (although not true in many cases). A document typically contains multiple opinions. Let us start our discussion with an example review:

I bought a Motorola phone two weeks ago. Everything was good initially. The ...

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