clr {chemometrics}

centered logratio transformation

Description

A data transformation according to the centered logratio transformation is done.

Usage

clr(X)

Arguments

X

numeric data frame or matrix

Details

The clr transformation is one possibility to transform compositional data to a real space. Afterwards, the transformed data can be analyzed in the usual way.

Value

Returns the transformed data matrix with the same dimension as X.

Author(s)

Peter Filzmoser <[e-mail]>

References

K. Varmuza and P. Filzmoser: Introduction to Multivariate Statistical Analysis in Chemometrics. CRC Press, Boca Raton, FL, 2009.

See Also

alr,ilr

Examples

data(glass)
glass_clr <- clr(glass)