clarkEvans: Clark-Evans index of neighbourhood pattern

In johngodlee/compInd: Forest tree-tree competition indices

Clark-Evans index of neighbourhood pattern

Description

Clark-Evans index of neighbourhood pattern

Usage

clarkEvans(x, area)

Arguments

x	two column matrix of individual x and y coordinates
area	area of the plot, in the same units as x and y coordinates

Details

Essentially the sum of nearest neighbour distances of all individuals in the plot, normalised by the density of individuals in the plot. Bounded between 0 and 2.15, with values <1 indicating a clustered distribution. A completely regular hexagonal distribution results in the highest value of 2.15.

Value

Value of the competition index for the structural unit, i.e. plot.

References

Clark, F. J., Evans, F. C. (1954). Distance to the nearest neighbour as a measure of spatial relationships in populations. Ecology. Volume 35. Pages 445-453

Examples

data(bicuar)
clarkEvans(bicuar[,c("x", "y")], 10000)

johngodlee/compInd documentation built on Aug. 5, 2024, 8:44 a.m.