Linear K Function
Computes an estimate of the linear K function for a point pattern on a linear network.
linearK(X, r=NULL, ..., correction="Ang", ratio=FALSE)
X |
Point pattern on linear network (object of class |
r |
Optional. Numeric vector of values of the function argument r. There is a sensible default. |
... |
Ignored. |
correction |
Geometry correction.
Either |
ratio |
Logical.
If |
This command computes the linear K function from point pattern data on a linear network.
If correction="none", the calculations do not include
any correction for the geometry of the linear network. The result is the
network K function as defined by Okabe and Yamada (2001).
If correction="Ang", the pair counts are weighted using
Ang's correction (Ang, 2010; Ang et al, 2012).
Function value table (object of class "fv").
Ang Qi Wei aqw07398@hotmail.com and Adrian Baddeley Adrian.Baddeley@curtin.edu.au.
Ang, Q.W. (2010) Statistical methodology for spatial point patterns on a linear network. MSc thesis, University of Western Australia.
Ang, Q.W., Baddeley, A. and Nair, G. (2012) Geometrically corrected second-order analysis of events on a linear network, with applications to ecology and criminology. Scandinavian Journal of Statistics 39, 591–617.
Okabe, A. and Yamada, I. (2001) The K-function method on a network and its computational implementation. Geographical Analysis 33, 271-290.
data(simplenet) X <- rpoislpp(5, simplenet) linearK(X) linearK(X, correction="none")
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