isometric logratio transformation

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Description

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

Usage

1
ilr(X)

Arguments

X

numeric data frame or matrix

Details

The ilr 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 one dimension less than X.

Author(s)

Peter Filzmoser <P.Filzmoser@tuwien.ac.at>

References

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

See Also

alr,clr

Examples

1
2
data(glass)
glass_ilr <- ilr(glass)

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