weights.symcoca {cocorresp}

Exctract CoCA model weights

Description

Extractor function to identify and select appropriate analysis weights from Co-correspondence Analysis models.

Usage

## S3 method for class 'symcoca'
weights(object, ...)

## S3 method for class 'predcoca'
weights(object, ...)

Arguments

object

an object of class "symcoca" or "predcoca".

...

arguments passed to other methods. Not used.

Value

A numeric vector of common site weights is currently returned. These correspond to R_{0} in ter Braak and Schaffers (2004).

Author(s)

Gavin L. Simpson

References

ter Braak, C.J.F and Schaffers, A.P. (2004) Co-Correspondence Analysis: a new ordination method to relate two community compositions. Ecology 85(3), 834–846.

See Also

envfit.coca uses these weights to estimate weighted correlations in ordination space. See coca for details on creating CoCA models.

Examples

## symmetric CoCA
data(beetles)
data(plants)

## log transform the bettle data
beetles <- log(beetles + 1)

## fit the model
bp.sym <- coca(beetles ~ ., data = plants, method = "symmetric")

## weights == R[0]
weights(bp.sym)