invALR: Inverse of additive logratios
In easyCODA: Compositional Data Analysis in Practice

Description Usage Arguments Details Value Author(s) References See Also Examples

Given additive logratios (ALRs) with respect to a specified part, compute the inverse (i.e. original parts)

1	invALR(ALRmatrix, part.names=paste("part",1:(ncol(ALRmatrix)+1),sep=""), denom=NA)

`ALRmatrix`	A matrix of additive logratios (ALRs) with respect to a specified part)
`part.names`	Part names in the reconstructed compositional data matrix
`denom`	The index of the denominator used in the computation of the ALRs (default: last part))

The function invALR computes the original parts, given the additive logratios (ALRs)

parts

The reconstructed parts (they add up to 1)

Michael Greenacre

Aitchison, J. (1986), The Statistical Analysis of Compositional Data, Chapman & Hall.
Greenacre, M. (2018), Compositional Data Analysis in Practice, Chapman & Hall / CRC Press.

ALR, LR, CLR, invCLR, LR.VAR

data(veg)
# compute additive logratios with respect to second part
veg.ALR <- ALR(veg, denom=2)$LR
# recover original parts (to get same order, specify the denominator used originally)
invALR(veg.ALR, denom=2)