Pertube: Compositional Pertubation

In tricolore: A Flexible Color Scale for Ternary Compositions

Description

Pertubate a compositional data set by a compositional vector.

Usage

Pertube(P, c = rep(1/3, 3))

Arguments

P	n by m matrix of compositions p1, ..., pm_i for i=1,...,n.
c	Compositional pertubation vector c1, ..., cm.

Value

n by m matrix of pertubated compositions.

References

Von Eynatten, H., Pawlowsky-Glahn, V., & Egozcue, J. J. (2002). Understanding perturbation on the simplex: A simple method to better visualize and interpret compositional data in ternary diagrams. Mathematical Geology, 34(3), 249-257.

Pawlowsky-Glahn, V., Egozcue, J. J., & Tolosana-Delgado, R. (2007). Lecture Notes on Compositional Data Analysis. Retrieved from https://dugi-doc.udg.edu/bitstream/handle/10256/297/CoDa-book.pdf

Examples

P <- prop.table(matrix(runif(12), 4), margin = 1)
cP <- tricolore:::Pertube(P, 1/tricolore:::Centre(P))
tricolore:::Centre(cP)

tricolore documentation built on April 28, 2020, 5:10 p.m.