Topic Analysis | JMP 13.2

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Basic Analysis • Text Explorer • Topic Analysis

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Topic Analysis

The Topic Analysis option performs a varimax rotation on the singular value decomposition (SVD) of the document term matrix (DTM). You must specify a number of rotated singular vectors, which corresponds to the number of topics that you want to retain from the DTM. After you specify a number of topics, the Topic Terms and Topic Scores Plots reports appear. Topic analysis is equivalent to a rotated principal component analysis (rotated PCA).

The varimax rotation takes a set of singular vectors and rotates them to make them point more directly in the coordinate directions (toward the terms). This rotation makes the vectors help explain the text as each rotated vector orients toward a set of words. Negative values indicate a repulsion force. The terms with negative values occur in a topic less frequently compared to the terms with positive values.

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Help created on 9/19/2017