invilr {robCompositions}R Documentation

Inverse isometric log-ratio transformation

Description

The inverse transformation of ‘ilr()’.

Usage

invilr(x.ilr)

Arguments

x.ilr data frame or matrix

Details

For details on the choice of the balances, please, see at the research report for which the link is given below.

Value

The transformed data.

Author(s)

Karel Hron

References

Egozcue J.J., V. Pawlowsky-Glahn, G. Mateu-Figueras and C. Barcel'o-Vidal (2003) Isometric logratio transformations for compositional data analysis. Mathematical Geology, 35(3) 279-300 \

Hron, K. and Templ, M. and Filzmoser, P. (2010) Imputation of missing values for compositional data using classical and robust methods Computational Statistics and Data Analysis, In Press, Corrected Proof, ISSN: 0167-9473, DOI:10.1016/j.csda.2009.11.023

See Also

ilr

Examples

require(MASS)
Sigma <- matrix(c(5.05,4.95,4.95,5.05), ncol=2, byrow=TRUE)
set.seed(123)
z <- mvrnorm(100, mu=c(0,2), Sigma=Sigma)
invilr(z)

[Package robCompositions version 1.3.3 Index]