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

Figure 1

Time series plots of ILINet data and original and updated GFT estimates.

A) ILINet data and GFT estimates from 2009. B) ILINet data and GFT estimates for the entire time period where GFT estimates are available: 2003–2009.

Figure 1

doi: https://doi.org/10.1371/journal.pone.0023610.g001