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What is the Value of a Positive Syndromic Surveillance Signal?
Content Type: Abstract
One criterion for evaluating the effectiveness of a surveillance system is the system’s positive predictive value. To our knowledge few studies have described the positive predictive value of syndromic surveillance signals… read more… for the Early Notification of Community-Based Epidemics (ESSENCE).3 Investigations are initiated for alarm signals … -
Systematic Comparison of Algorithms Used in Syndromic Surveillance
Content Type: Abstract
Varied approaches have been used by syndromic surveillance systems for aberration detection. However, the performance of these methods has been evaluated only across a small range of epidemic characteristics. Objective… read more… Weighted Moving Average (EWMA) algorithms used by the ESSENCE system [3], with smoothing constants of 0.4 and 0.9; …