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To account for topic correlation, we ran exploratory factor analysis on topic scores using varimax rotation. Based on the scree plot, we decided to use a 50-factor solution that exhibited a close fit (root mean square error of approximation of 0.01807) explaining 32.5% of overall variation. The resulting factors may be viewed as patterns of user behavior.
In summary, the LDA topics clustered together aspects of messages that likely had some similarity.
J Med Internet Res 2016;18(8):e241
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