KD: Bivariate nearest neighbor distance function (D) and...

In petrkeil/spasm: Species association measures for various data types

Description

Bivariate nearest neighbor distance function (D) and K-function (K)

Usage

KD(X, spec.1, spec.2, n.iter, radius)

Arguments

X	Object of class 'ppp' (from 'spatstat' packge). This is a marked point pattern in which each mark gives identity of a species. Thus, the object must have at least 2 species.
spec.1	Character string indicating name of species 1 in the 'ppp' object.
spec.2	Character string indicating name of species 2 in the 'ppp' object.
n.iter	Number of iterations for simulation from a homogeneous Poisson point process.
radius	Radius for which the D and K functions should be calculated

Value

A list.

References

Wiegand T. et al. (2007) Species associations in a heterogeneous Sri Lankan dipterocarp forest. American Naturalist 170: E77-E95.

Wang X. et al. (2010) Species associations in an old-growth temperate forest in north-eastern China. Journal of Ecology, 95: 674-686.

Wiegand T. & Moloney K. A. (2014) Handbook of spatial point pattern analysis in ecology. CRC press.

petrkeil/spasm documentation built on Jan. 15, 2021, 6:08 p.m.