gsigetbalstruct: An auxiliary functions to compute user-defined ilr and ipt...

In compositions: Compositional Data Analysis

An auxiliary functions to compute user-defined ilr and ipt transforms.

Description

Parses the expressions for the balance functions.

Usage

gsi.getBalStruct(descr,names,allowMinus=FALSE,allowOne=FALSE)

Arguments

descr	the expression
names	character: the variables in the dataset
allowMinus	whether to allow for - as a synonym for /
allowOne	whether to allow 1 as a variable name playing the role of a a constant.

Details

These functions will not be usually called on themselves, but through their wrappers, mainly balanceBase.

Value

provides a list of pairs giving the components in the Numerator and the Denominator of the balances.

Note

It is better not to use gsi.* functions directly since they are internal functions of the package. Use their wrappers.

Author(s)

Raimon Tolosana-Delgado, K.Gerald v.d. Boogaart http://www.stat.boogaart.de

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

See Also

ilrBase,ipt,ilr, https://ima.udg.edu/Activitats/CoDaWork03/

Examples

#gsi.getBalStruct(~A/B/C,c("A","B","C"))

compositions documentation built on April 14, 2023, 12:26 a.m.