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Python Data Analysis by Ivan Idris

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Sentiment analysis

Opinion mining or sentiment analysis is a hot, new research field dedicated to the automatic evaluation of opinions as expressed on social media, product review websites, or other forums. Often, we want to know whether an opinion is positive, neutral, or negative. This is, of course, a form of classification as seen in the previous section. As such, we can apply any number of classification algorithms. Another approach is to semiautomatically (with some manual editing) compose a list of words with an associated numerical sentiment score (the word "good" can have a score of 5 and the word "bad" a score of -5). If we have such a list, we can look up all words in a text document and, for example, sum up all the found sentiment ...

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