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. 2015 May 14;11(5):e1004239. doi: 10.1371/journal.pcbi.1004239

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Fig 1 — Here we show the linear regression of one weeks prior ILI observation, a constant term, and the access logs of five Wikipedia articles related to influenza to the current ILI observation. The regression is highly correlated to the true ILI outcome. However, due to the simple form of this linear regression it is difficult to quantify which of the six regressors used was most influential in predicting ILI.