TOPIC MODELING: WHY, WHAT, AND HOW

@BrianCroxallBrown University

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WHY?WHAT? HOW?

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WHY?WHAT?

“A topic model is a type of statistical model for discovering theabstract ‘topics’ that occur in a collection of documents.”

Wikipedia

“A topic model is a type of statistical model for discovering the abstract ‘topics’ that occur in a collection of documents.”

Wikipedia

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1. Every word in a text belongs to a topic.

2. Every word in a text is generated from one of the topics thatmake up the text.

3. Each text is made up of all the topics you could ever find.

4.The computer does not need to know what the words mean.

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Topic Modeling ≈ LDALatent Dirichlet Allocation

EXAMPLES

MINING THE DISPATCHRobert Nelson

University of Richmond

MODELING PMLATed Underwood, University of Illinois

Andrew Goldstone, Rutgers University

QUANTIFYING KISSINGERMicki Kaufman, CUNY Graduate Center

WHY?WHAT? HOW?

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THANKS.@briancroxall / briancroxall.net