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As described in previous studies [18,21], three modules on the Baidu Index platform—(1) the searching trend, (2) user demand, and (3) the demographic portrait module—enabled the analysis of search demand by examining trends in popularity, topic-related concerns, and the geodemographic features of each topic. The Baidu search index (BSI) value is the key index that numerically scales the popularity of each search keyword.
JMIR Form Res 2025;9:e55670
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Baidu, as the most widely used Chinese search engine, accounts for two-thirds of China’s search engine market share [3]. At the time of the COVID-19 outbreak, we found that the number of searches for COVID-19 had increased exponentially, despite the fact that its incidence and mortality rates were much lower than those of some noncommunicable diseases, such as cancer. Hence, this phenomenon is worthy of further attention and discussion.
We obtained web search data from the Baidu Index [4].
J Med Internet Res 2020;22(7):e18831
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Google Trends (GT) and the Baidu Index (BI) are examples of Big Data surveillance tools that were developed to help researchers analyze temporal and geographical trends in online search terms or topics through the Google and Baidu search engines, respectively [11,12].
JMIR Public Health Surveill 2020;6(2):e19702
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