Figure 9
From: Early detection of influenza outbreak using time derivative of incidence
The regions that start earlier than other regions. The city-county-districts where the outbreak start week is earlier than or equals to \(M_{s}\) for all seven influenza seasons are marked as red in Fig. 9(a). Here, \(M_{s}\) is the median of outbreak start weeks. In Fig. 9(b), we show the metro and rural areas depicted in gray and white, respectively, for comparison