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Department of Statistics, UCLA

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Assessing Spatial Point Process Models Using Weighted K-functions: Analysis of California Earthquakes

  • Author(s): Veen, Alejandro
  • Schoenberg, Frederic Paik
  • et al.

We investigate the properties of a weighted analogue of Ripley’s K-function which was first introduced by Baddeley, Møller, and Waagepetersen. This sta- tistic, called the weighted or inhomogeneous K-function, is useful for assessing the fit of point process models. The advantage of this measure of goodness- of-fit is that it can be used in situations where the null hypothesis is not a stationary Poisson model. We note a correspondence between the weighted K- function and thinned residuals, and derive the asymptotic distribution of the weighted K-function for a spatial inhomogeneous Poisson process. We then present an application of the use of the weighted K-function to assess the goodness-of-fit of a class of point process models for the spatial distribution of earthquakes in Southern California.

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