minglingF: Spatial Minling index

In antiphon/spatialsegregation: Segregation Measures for Multitype Spatial Point Patterns

Description

Compute the Mingling index for a given multitype point pattern.

Usage

minglingF(X, r = NULL, target = NULL, ratio = FALSE, ...)

mingling.index(X, r = 4, ntype = "knn", ...)

Arguments

X	Multitype point pattern of class ppp (see package 'spatstat')
r	Vector of sizes for neighbourhoods, e.g. geometric graph with different ranges.
target	Default NULL. Calculate only for target type. If NULL computes for each type + mean over all types.
ratio	Default FALSE. If TRUE, scale the typewise values $M_t$ using formula $(1-M_tau)/lambda_tau$ which equals 1 for Poisson CSR.
...	Further parameters for the function segregationFun.
ntype	The original mingling index uses knn neighbourhood type.

Details

Extension of Mingling index introduced by Lewandowski\&Pommerening 1997. Measures the proportion of alien points in the neighbourhood of a specific type typical point of the pattern.

If no specific type is given, the function takes mean over all types. A typewise value is more useful, so they are also included.

The function minglingF is the main calculation function. Uses function segregationFun.

The function mingling.index is a shortcut to get a single value for the pattern. Uses 4-nn graph by default, which is the original Mingling index used by Lewandowski\&Pommerening 1997 and Graz 2004.

Functions

• mingling.index: Shortcut to 4-nearest neighbours index.

References

Graz: The behaviour of the species mingling index $m_{sp}$ in relation to species dominance and dispersion. Eur. J. forest research. 123:87-92, 2004.

Lewandowski, Pommerening: Zur Beschreibung der Waldstruktur - Erwartete und beobachtete Arten-Durchmischung. Forstwiss Centralbl, 116:129-139, 1997.

Rajala, Illian: A family of spatial biodiversity measures based on graphs, Env. Ecol. Stat. 2012

antiphon/spatialsegregation documentation built on Nov. 21, 2020, 10:39 p.m.