provenance (version 0.5)

clr: Centred logratio transformation

Description

Calculates Aitchison's centered logratio transformation for a dataset of class compositional

Usage

clr(x, ...)
## S3 method for class 'compositional':
clr(x, ...)

Arguments

x

an object of class compositional

...

optional arguments of the generic function

Value

• a matrix of clr coordinates

Examples

# The following code shows that applying provenance's PCA function
# to compositional data is equivalent to applying R's built-in
# princomp function to the clr transformed data.
data(Namib)
plot(PCA(Namib$Major))
dev.new()
clrdat <- clr(Namib$Major)$x
biplot(princomp(clrdat))