
214 Spatial Point Patterns: Methodology and Applications with R
Figure 7.13. Edge effect problem for estimation of the K-func tion. If we can only observe the points
inside a window W (solid lines), then the number of points inside a circle (dashed lines) of radius r,
centred on a point of the process insid e W, is not known if the circle extends outside W . The number
of points observed inside the circle (i.e. counting only points within the window) is typically less
than the true number.
pattern, accordin g to a uniform Poisson process with intensity
λ
= 100 in th e unit square. The
uncorrected function
b
K
un
(r) is plotted in Figure 7.14 together with ...