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Assessing Google Flu Trends Performance in the United States during the 2009 Influenza Virus A (H1N1) Pandemic

Figure 2

Time series plots of ILINet data and category-level GFT estimates.

Category-level estimates are created by applying the GFT methodology to a subset of the queries in a given model. A) ILINet data and GFT estimates based on original model queries related to influenza complications. B) ILINet data and GFT estimates based on updated model queries related to specific influenza symptoms.

Figure 2