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Spatial Scan Kulldorf 1 - Further Methods for Point Pattern...

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1 Lecture 11 October 7, 2003 Further Methods for Point Pattern Analysis Bailey and Gatrell Chapter 4 n Certain types of events will exhibit clustering due to heterogeneity in the underlying distribution Variations in Population e.g disease cases or crimes will tend to cluster where the population is higher n In such cases we need to “correct” for the the underlying variations in the population Use of Kernel Estimates ( 29 - = = t t l t i n i s s k s 1 2 1 ˆ § Kernel estimate estimates events per unit area § Reconsider as estimate of events per unit population § Divide estimated intensity at location s by an estimate of population density at s § How to estimate population density at s?
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