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http://www.pagina12.com.ar/diario/suplementos/futuro/13-1976-2008-08-10.html
http://www.readwriteweb.com/archives/google_report_reliable_trends_faster.php Google released a research paper yesterday that takes an in-depth look at Google Trends and Google Insights for Search and compares its trend results against more mainstream industry reports based on actual sales data in several different categories like auto sales and home sales. Several statistical models are explained and compared, and relative accuracy is determined for each model.

Trends vs Market Reports: Which is More Accurate, Faster?