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To better focus on the changes of MSVs and to ease the magnitude of differences between MSVs, we followed the studies by Chu et al [36] and So et al [37] to obtain square-rooted-differenced data. Thus, the square-rooted-differenced MSV matrix (Yt) at time t is as follows:
A covariance matrix (ρt) of each search term in the square-rooted-differenced MSV matrix (Yt) can be determined, where the correlation between the search terms i and j at time t is .
JMIR Public Health Surveill 2023;9:e42446
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