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Assessing Google flu trends performance in the United States during the 2009 influenza virus A (H1N1) pandemic.

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Figure 1. Time series plots of ILINet data and original and updated GFT estimates. A) ILINet data and GFT estimates from 2009
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
Figure 3 shows ILINet data and estimates from single-query models for the original-model queries [symptoms of flu], [symptoms of bronchitis], and [symptoms of pneumonia]
Table 3. Category-level query volume before and during the pH1N1 pandemic in the updated United States GFT model.

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