tmd {lattice} | R Documentation

## Tukey Mean-Difference Plot

### Description

Create Tukey Mean-Difference Plots from a trellis object returned by `xyplot` and `qq`

### Usage

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

### Arguments

`object` | An object of class ``trellis'' returned by `xyplot` or `qq`
`xlab` | x label
`ylab` | y label
`panel` | panel function to be used
`prepanel` | prepanel function used to recalculate limits using the modified `x, y` values
`...` | other arguments

### 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`.

`tmd` uses the `update` method for ``trellis'' objects, which processes all extra arguments supplied to `tmd`.

### Value

An object of class ``trellis''. The `update' method can be used to update components of the object and the `print' method (usually called by default) will plot it on an appropriate plotting device.

### Author(s)

Deepayan Sarkar deepayan@stat.wisc.edu

### See Also

`panel.tmd`, `xyplot`, `Lattice`

### Examples

    data(singer)
    tmd(qqmath(~height|voice.part, data = singer))

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