rgr (version 1.1.7)

gx.vm: Display an Aitchison Variation Matrix for Compositional Data

Description

The function computes and displays an Aitchison Variation matrix, with the variances and means of the log-ratios in the upper and lower triangles, respectively.

Usage

gx.vm(xx, ifwarn = TRUE)

Arguments

xx

a matrix, or sub-matrix, of parts from a compositional data set.

ifwarn

by default ifwarn = TRUE which generates a reminder/warning that when carrying out analyses of compositional data all data must be in the same measurement units. The message can be suppressed by setting ifwarn = FALSE.

References

Aitchison, J., 1984. The statistical analysis of geochemical compositions. Mathematical Geology, 16(6):531-564. Aitchison, J., 1986. Ths Statistical Analysis of Compositional data. Chapman and Hall, London, U.K., 416 p. Filzmoser, P, Hron, K. and Reimann, C., 2010. The bivariate statistical analysis of environmental (compositional) data. Science of the Total Environment, 408(19), 4230-4238.

See Also

ltdl.fix.df, remove.na, gx.sm

Examples

## Make test data available
data(sind.mat2open)

## Compute Aitchison Variation Matrix
gx.vm(sind.mat2open)