partykit (version 1.0-4)

HuntingSpiders: Abundance of Hunting Spiders

Description

Abundances for 12 species of hunting spiders along with environmental predictors, all rated on a 0--9 scale.

Usage

data("HuntingSpiders")

source

Package mvpart (currently archived, see http://CRAN.R-project.org/package=mvpart).

Details

The data were originally analyzed by Van der Aart and Smeenk-Enserink (1975). De'ath (2002) transformed all variables to the 0--9 scale and employed multivariate regression trees.

References

Van der Aart PJM, Smeenk-Enserink N (1975). Correlations between Distributions of Hunting Spiders (Lycosidae, Ctenidae) and Environmental Characteristics in a Dune Area. Netherlands Journal of Zoology, 25, 1--45. De'ath G (2002). Multivariate Regression Trees: A New Technique for Modelling Species-Environment Relationships. Ecology, 83(4), 1103--1117.

Examples

## load data
data("HuntingSpiders", package = "partykit")

## fit multivariate tree for 12-dimensional species abundance
sptree <- ctree(arct.lute + pard.lugu + zora.spin + pard.nigr + pard.pull +
  aulo.albi + troc.terr + alop.cune + pard.mont + alop.acce + alop.fabr +
  arct.peri ~ herbs + reft + moss + sand + twigs + water, data = HuntingSpiders,
  teststat = "max", minsplit = 5)
plot(sptree, terminal_panel = node_barplot)