niche.overlap.boot: Boostrap of niche overlap

In spaa: SPecies Association Analysis

Description

Bootstrap of niche overlap between species.

Usage

niche.overlap.boot(mat, method = c("pianka", "schoener", "petraitis",  
    "czech", "morisita", "levins"), times = 999, quant = c(0.025, 0.975))

Arguments

mat	A community data matrix with columns representing species, and rows representing sites.
method	A character string indicating the index of niche overlap to be applied.
times	Interger, Number of bootstrap to be implemented.
quant	Quantile of bootstrap results, the confidence intervals.

Details

This function bootstraps the niche overlap within each pair of species. \ pianka: Pianka's niche overlap index\ schoener: Schoener's niche overlap index\ petraitis: Petraitis' niche overlap index\ czech: Czechanowski index \ morisita: Morisita's overlap index\ levins: Levin's overlap index\ see more information from Gotelli, N(2009).\

Value

a data frame with each row for each pair of species the columns are "Observed", \ "Boot mean", \ "Boot std", \ "Boot CI1", \ "Boot CI2", \ "times" \

Author(s)

Jinlong Zhang [e-mail]

References

Zhang Jin-tun,(2004 ) Quantitative Ecology, Science Press, Beijing\

Nicholas J. Gotelli. 2000. Null model analysis of species co-occurrence patterns. Ecology 81:2606-2621. http://esapubs.org/archive/ecol/E081/022/EcoSim

See Also

niche.overlap.boot.pair

Examples

data(datasample)
niche.overlap.boot(datasample[,1:4], method = "pianka")
niche.overlap.boot(datasample[,1:4], method = "schoener")
niche.overlap.boot(datasample[,1:4], method = "czech") 
niche.overlap.boot(datasample[,1:4], method = "levins")

spaa documentation built on May 2, 2019, 9:44 a.m.