Figure 4From: Detection of influenza-like illness aberrations by directly monitoring Pearson residuals of fitted negative binomial regression modelsDaily observed influenza-like illness outpatient visits in central Taiwan in 2009 (A), and results of aberration detection by proposed method (B), by modified CUSUM applied to the Pearson residuals (C). *Note: Detected aberration signals are marked with a red x at the top. The time period between the two dashed lines was August 2009.Back to article page