spatialsegregation-mingling {spatialsegregation}R Documentation

Spatial Mingling Index

Description

Compute the Mingling index for a given multitype point pattern.

Usage

 minglingF(pp, parvec = 1:20, graph_type = "knn", type = NULL, ratio = FALSE, ...)
 mingling_index(pp, graph_type = "knn", graph_par = 4, type = NULL, ...)

Arguments

pp Multitype point pattern (see package 'spatstat')
parvec Default 1:20. Vector for the neighbourhood defining graph, e.g. geometric graph with different r.
graph_type Default knn. Type of the neighbourhood graph. Accepts: knn, geometric, delauney, gabriel.
type Default NULL. Calculate only for type 'type'. If NULL compute 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.
graph_par The single parameter to calculate the value in.
... Further tuning parametes for the function segregationFun.

Details

Date: 2009-03-09
License: GPL v2 or later

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 means over all types. A typewise value is more useful.

The function minglingF is the main calculation function. Uses function segregationFun with parameter ftype=1.

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.

Author(s)

Tuomas Rajala University of Jyvaskyla, Finland tarajala@maths.jyu.fi

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: Graph-based description of mingling and segregation in multitype spatial point patterns. To appear 2009.


[Package spatialsegregation version 1.93 Index]