Figure 3
From: Rapid detection of pandemic influenza in the presence of seasonal influenza
Detection specificity of the WCR method. An illustration of how we calculate the specificity (Sp) of the WCR algorithm as a function of the detection threshold δ. The straight-line plots show two values of δ: 0.000059 (dashed line) and 0.0008 (dot-dash line) which give specificity of 99% and 95% respectively. The other plots are probability values of (WCR, NHB) in any given week for different seasons. If the probability in any given week dips below one of the threshold probabilities, then a false positive alert for a pandemic outbreak is generated.