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. 2015 Jan 29;5:8154. doi: 10.1038/srep08154

Figure 3. Region 2 Time Trend during the 2009 H1N1 Pandemic.

Figure 3

Google Flu Trends is particularly prone to error during pandemics. The top panel compares the network model (pink) and GFT on its own (blue) to laboratory confirmed influenza levels during the 2009–2010 season. The y-axis on the bottom panel is the residual of the network model subtracted from the residual of Google's model at any given week, with areas above the red line indicating times in which the network model outperformed Google on its own. The proportional reduction in error of the network model compared to GFT during this time span is 31%.