Method and systems for estimating and visualising a plurality of topics in a collection of documents, wherein the collection of documents comprises a plurality of words and each document comprises one or more of the plurality of words, the method comprising: performing two rounds of topic modelling to the collection of documents, wherein the first round of topic modelling estimates a plurality of topics associated with the collection of documents and each topic comprises one or more words, and the second round identifies a plurality of themes associated with the topics, wherein each theme comprises one or more topics; and visually representing the topics and themes to a user.
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