tmd
Creates Tukey Mean-Difference Plots from a trellis object
returned by xyplot
, qq
or qqmath
. The prepanel
and panel functions are used as appropriate. The formula
method for tmd
is provided for convenience, and simply calls
tmd
on the object created by calling xyplot
on that
formula.tmd(object, ...)## S3 method for class 'trellis':
tmd(object,
xlab = "mean",
ylab = "difference",
panel,
prepanel,
\dots)
prepanel.tmd.qqmath(x,
f.value = NULL,
distribution = qnorm,
qtype = 7,
groups = NULL,
subscripts, ...)
panel.tmd.qqmath(x,
f.value = NULL,
distribution = qnorm,
qtype = 7,
groups = NULL,
subscripts, ...)
panel.tmd.default(x, y, groups = NULL, ...)
prepanel.tmd.default(x, y, ...)
"trellis"
returned by
xyplot
, qq
or qqmath
.panel.qqmath
.xyplot
.x=(x+y)/2
and y=y-x
, which are then plotted. The
default panel function(s) add a reference line at y=0
as well. tmd
acts on the a "trellis"
object, not on the actual plot
this object would have produced. As such, it only uses the arguments
supplied to the panel function in the original call, and completely
ignores what the original panel function might have done with this
data. tmd
uses these panel arguments to set up its own scales
(using its prepanel
argument) and display (using
panel
). It is thus important to provide suitable prepanel and
panel functions to tmd
depending on the original call.
Such functions currently exist for xyplot
, qq
(the ones
with default
in their name) and qqmath
, as listed in the
usage section above. These assume the default displays for the
corresponding high-level call. If unspecified, the prepanel
and
panel
arguments default to suitable choices.
tmd
uses the update
method for "trellis"
objects,
which processes all extra arguments supplied to tmd
.
qq
, qqmath
, xyplot
,
Lattice
tmd(qqmath(~height | voice.part, data = singer))
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