R: Distance - Distance Plot

ddPlot.covfm {robust} | R Documentation

## Distance - Distance Plot

### Description

For a `covfm` object containing 2 models, this function plots the Mahalanobis distance from the first model on the y-axis and the Mahalanobis distance from the second model on the x-axis.

### Usage

    ddPlot.covfm(x, level = 0.95, strip = "", id.n = 3, ...)

### Arguments

`x` | a `"covfm"` object.
`level` | a single numeric value between 0 and 1 giving the chi-squared percent point used to compute the outlyingness threshold.
`strip` | a character string printed in the “strip” at the top of the plot.
`id.n` | a single nonnegative integer specifying the number of extreme points to label in the plot.
`...` | additional arguments are passed to `xyplot`.

### Value

if the models can be compared then the plotted `trellis` object is invisibly returned. Otherwise `x` is returned invisibly.

### Examples

     data(woodmod.dat)
     woodm.fm <- fit.models(list(Robust = "covRob", Classical = "covClassic"),
                            data = woodmod.dat)
     ddPlot.covfm(woodm.fm, main = "Plot Title", xlab = "x-axis label",
                  ylab = "y-axis label", pch = 4, col = "purple")

[Package robust version 0.6-0 Index]