Google Trends Case Study

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Study Design This longitudinal retrospective study analyzed the dental caries-related computational metadata of eight countries, using the online tool Google Trends. The topic “Dental Caries – Syndrome” was accessed to determine the Search Volume Index (SVI) and the main queries applied by Google users to find specific information. DALYs indices and the Internet penetration were also obtained for each country. Thus, the collected data were evaluated in accordance with the following aspects: (i) reliability, (ii) correlation between SVI and DALYs for dental caries in permanent teeth, (iii) search volume trends, (iv) seasonality, (v) development of forecasting models, and (vi) most popular related queries. Search Volume Trends The results of Google Trends are depicted as a time trend curve of the weekly or monthly variation of the…show more content…
(ii) Data validation: this analysis was based on the correlation between SVI and DALYs for dental caries in permanent teeth. Since the data were not available, the linear interpolation was used to establish the values of DALYs for dental caries in the year 2004. Subsequently, the mean variations of both SVI and DALYs between the years 2004, 2005, 2010 and 2013 were calculated. The Pearson’s test was applied to observe the correlation levels between the two indicators. (iii) Search volume trends: the trends of SVI time series for dental caries were analyzed by the autocorrelation and partial autocorrelation plots. Also, Pearson’s test was used to compare the directions and changes in dental caries interests of Google users from different

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