ENBIS-17 in Naples

9 – 14 September 2017; Naples (Italy) Abstract submission: 21 November 2016 – 10 May 2017

Monitoring the Number of Disease Events and their Spatial Distribution Using Convex Hulls

11 September 2017, 18:10 – 18:30


Submitted by
Sotiris Bersimis
Sotiris Bersimis (University of Piraeus), Athanasios Sachlas (University of Piraeus), Polychronis Economou (University of Patras)
In this work, we combine the well-known c-chart with the use of convex hulls in order to propose a new biosurveillance method. The method utilizes the area of a convex hull removing the furthest point, with criterion the largest reduction of the area by removing a point from the boundary of the convex hull. The rationale of the test is that the area should be reduced uniformly at a rate of 1/n when we remove the most remote point. A simulation study was conducted in order to determine the critical values of the test statistic. The assessment of several scenarios showed an excellent performance of the new test.

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