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Similar to Liu et al [24], we used the pruned exact linear time (PELT) algorithm [31] to find the first change point of the term frequency. Unigrams before the first change point were regarded as top unigrams, and the term frequencies of the unigrams after the change point were significantly lower than those of the top unigrams. Similar processes were carried out for bigrams.
J Med Internet Res 2022;24(6):e37466
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