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.
ddPlot.covfm(x, level = 0.95, strip = "", id.n = 3, ...)
a "covfm"
object.
a single numeric value between 0 and 1 giving the chi-squared percent point used to compute the outlyingness threshold.
a character string printed in the “strip” at the top of the plot.
a single nonnegative integer specifying the number of extreme points to label in the plot.
additional arguments are passed to xyplot
.
if the models can be compared then the plotted trellis
object is
invisibly returned. Otherwise x
is returned invisibly.