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[D] How to do trend analysis on textual data

Hi all, I am now working on a dataset of customer reviews and we would like to analyze how customer feedback change across time. For sentiment it is easy as I can build a sentiment classifier and have a sentiment scores, and do conventional time-series analysis on the score. However, when it comes to analysis like topic-modeling, is there any time-trend related analysis on topic-modeling? Thanks for any advices.

submitted by /u/InventorWu
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