lattice (version 0.3-1)

tmd: Tukey Mean-Difference Plot

Description

Create Tukey Mean-Difference Plots from a trellis object returned by xyplot (and perhaps qq as well in future)

Usage

tmd(object, xlab = "mean", ylab = "difference", ...)

Arguments

object

An object of class ``trellis''. Currently only the value returned by xyplot gives sensible results.

xlab

x label

ylab

y label

...

other arguments, see trellis.args

Value

• An object of class ``trellis''.

synopsis

tmd(object, aspect = "fill", as.table = object$as.table, between = list(x = object$x.between, y = object$y.between), key = object$key, layout = object$layout, main = object$main, page = object$page, panel = panel.tmd, par.strip.text = object$par.strip.text, prepanel = NULL, scales = list(), strip = object$strip, sub = object$sub, xlab = "mean", xlim = NULL, ylab = "difference", ylim = NULL, ..., subscripts = !is.null(groups), subset = TRUE)

Details

The Tukey Mean-difference plot is produced by modifying the (x,y) values of each panel as follows: the new coordinates are given by x=(x+y)/2, y=y-x.

Most arguments given to produce object are transmitted to tmd, with the notable exceptions of aspect and scales. (This behaviour is different from S-Plus.)

See Also

panel.tmd, trellis.args, Lattice

Examples

data(singer)
tmd(qqmath(~height|voice.part, data = singer))
tmd(qq(voice.part ~ height, aspect = 1, data = singer,
   subset = (voice.part == "Bass 2" | voice.part == "Tenor 1")))