ILR: Isometric logratio

In easyCODA: Compositional Data Analysis in Practice

Description

Computation of a single isometric logratio (ILR)

Usage

ILR(data, numer=NA, denom=NA, weight=TRUE)

Arguments

data	A compositional data frame or matrix
numer	Vector of parts in the numerator
denom	Vector of parts in the denominator
weight	Logical indicating if a varying weight is returned (default:TRUE). If FALSE, a weight based on equally-weighted parts is returned. Alternatively a positive weight can be specified.

Details

The function ILR computes a single isometric logratio based on the specified numerator and denominator parts that define the two geometric means in the ratio.

Value

LR	The isometric logratio (ILR)
LR.wt	The weight assigned to the ILR

Author(s)

Michael Greenacre

References

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

See Also

SLR, ALR, PLR, LR

Examples

data(veg)
ILR(veg, numer=1, denom=2:3)

easyCODA documentation built on Sept. 20, 2020, 1:07 a.m.