picante (version 0.4-0)

randomizeSample: Null models for community data matrix randomization

Description

Various null models for randomizing community data matrices

Usage

randomizeSample(samp, null.model = c("frequency", "richness", "independentswap", "trialswap"),
                iterations = 1000)

Arguments

samp

Community data matrix

null.model

Null model frequency{ Randomize community data matrix abundances within species (maintains species occurence frequency)} richness{ Randomize community data matrix abundances within samples (maintains sample species richne

iterations

Number of independent or trial-swaps to perform

Value

• Randomized community data matrix

References

Gotelli, N.J. 2000. Null model analysis of species co-occurrence patterns. Ecology 81: 2606-2621

Miklos I. & Podani J. 2004. Randomization of presence-absence matrices: Comments and new algorithms. Ecology 85: 86-92.

Examples

data(phylocom)
randomizeSample(phylocom$sample, null.model="richness")