gx.md.plt0: Function to Display Chi-square plots of Mahalanobis Distances
In rgr: Applied Geochemistry EDA

Description Usage Arguments Author(s) See Also Examples

This function is not called directly by the user but from functions that plot Mahalanobis distances, i.e. gx.md.gait and gx.md.plot.

1
2
3

 
gx.md.plt0(md, n, p, trim = trim, ptrim = -1, proc = proc,
	main = main, ifadd = ifadd, cexf = cexf, cex = cex, ...)

`md`	a vector of Mahalanobis distances of length n.
`n`	the length of the vector of Mahalanobis distances.
`p`	the number of variables upon which the Mahalanobis distances are based.
`trim`	the number of individuals (observations or samples) that have been trimmed, and did not contribute to the estimation of covariance and means.
`ptrim`	the percentage trim requested, if a percentage (MVT) trim was requested.
`proc`	the procedure by which the Mahalanobis distances were estimated, used to ensure appropriate labelling of the Chi-square plot x-axis.
`main`	the title for the Chi-square plot.
`ifadd`	the probability based fences to be displayed on the Chi-square plots, set by the calling function and the user.
`cexf`	the text scale expansion factor for the annotation of the probability based fences, set by the calling function and the user.
`cex`	the text scale expansion factor for the other annotation within the ‘frame’ of the Chi-square plot, set by the calling function and the user.
`...`	further arguments to be passed to methods concerning the generated plots. For example, if some colour other than black is required for the plotting characters, specify `col = 2` to obtain red (see `display.lty` for the default colour palette). If it is required to make the plot title or axis labelling smaller, add `cex.main = 0.9` or `cex.lab = 0.9`, respectively, to reduce the font size by 10%.

Robert G. Garrett

gx.md.gait, gx.md.plot, gx.add.chisq

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

## Generate and display sets of Mahalanobis distances
gx.md.gait(ilr(sind.mat2open))
gx.md.gait(ilr(sind.mat2open), mcdstart = TRUE, ifadd = NULL)
gx.md.gait(ilr(sind.mat2open), mcdstart = TRUE, mvtstart = TRUE, trim = 3,
ifadd = 0.9)