Collection of measures or summaries of spatial multitype exposure: segregation vs. mingling of different types of points in a plane.
This is a collection of summaries for multitype spatial point patterns (see package spatstat for more).
The package is developed for an article Rajala\&Illian 2010, and provides summaries for detecting simple inter-type effects in the pattern.
See the help of the functions for further information.
Package provides an example dataset object called exposurepps, documented separately.
Also, the Dixon bivariate test based on contingency tables is available.
Functions ------------------ segregationFun - General calculation function, please use one of the following wrappers: minglingF - Mingling index shannonF - Spatial Shannon index simpsonF - Spatial Simpson index isarF - ISAR functionmingling.index - Shortcut for a single value shannon.index - -''- simpson.index - -''- isar.index - -''-
dixon - Dixon's 2-type contingency table tests
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
Reardon, O'sullivan: Measures of spatial segregation. Sociological methodology, 34:121-162, 2004.
Shimatani, Kubota: Quantitative assesment of multispecies spatial pattern with high species diversity. Ecological Research, 19, 2004.
Wiegand, Gunatilleke, Gunatilleke, Huth: How individual species structure diversity in tropical forests. PNAS, nov 16, 2007.
# NOT RUN {
data(exposurepps)
help(exposurepps)
# }
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