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Lexical feature selection #
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Natural Language Processing

The main question is this: how can we identify terms that are overrepresented in a given set of document?

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Log odds ratio informative Dirichlet prior #

When you want to contrast two corpora (e.g. Democrats vs. Republican). Needs a (big) background corpus. Seems to work really well in many cases.

An interesting application to restaurant menus: [](Narrative framing of consumer sentiment in online restaurant reviews)


tf-idf #

Pointwise mutual information #

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