Topic Models - Text Mining: Classification, Clustering, and Applications - page 88

Rather, topic models are a useful exploratory tool. The topics provide a
summary of the corpus that is impossible to obtain by hand; the per-document
decomposition and similarity metrics provide a lens through which to browse
and understand the documents. A topic model analysis may yield connections
between and within documents that are not obvious to the naked eye, and
find co-occurrences of terms that one would not expect a priori.
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