make.similarity.matrix: Calculate similarity matrix for set of phrases.
Description
First get phrase appearance pattern on positive labeling
(if not directly passed)
and then calculate similarity matrix of how they are similar
to each other.
Usage
make.similarity.matrix(result)
Arguments
result
An textreg.result object or a matrix from make.appearance.matrix
Details
Warning: for 'negative weight' phrases this method does not do well since it ignores
negative documents.