Rankings in regions and in languages
Google Trends uses IP address information from the server logs to make a best guess about where queries originated. Language information is determined by the language version of the Google site where the search originated.
From seeing trend and analyzing figures on a daily basis, a lot of things can be done to project (and prevent) some future events.
'Fluctuations in the frequency with which people search for certain words or phrases online can improve the accuracy of the econometric models', argues Hyunyoung Choi and as Alan Greenspan's work in his early career. (He's not popular with the belief that the market is right and can self-correct at this moment. Yet there are always something to be learnt irrespective of right or wrong.)
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