This transformation was done in order to down-weight those terms which are common across all hashtags, like ‘COVID19’ and up-weight those terms which may be significant for cluster structure.
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Characterizing communities of hashtag usage on twitter during the 2020 COVID-19 pandemic by multi-view clustering.
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The sentences
While, there is an increasing trend toward fewer and larger clusters, there are oscillations present within the data, especially during the middle of the time period, around the month of March.