lattice (version 0.20-21)

B_05_qq: Quantile-Quantile Plots of Two Samples

Description

Quantile-Quantile plots for comparing two Distributions

Usage

qq(x, data, ...)
## S3 method for class 'formula':
qq(x, data, aspect = "fill", 
   panel = lattice.getOption("panel.qq"),
   prepanel, scales, strip, 
   groups, xlab, xlim, ylab, ylim, f.value = NULL, 
   drop.unused.levels = lattice.getOption("drop.unused.levels"),
   ...,
   lattice.options = NULL,
   qtype = 7,
   default.scales = list(),
   default.prepanel = lattice.getOption("prepanel.default.qq"),
   subscripts,
   subset)

Arguments

x

The object on which method dispatch is carried out.

For the "formula" method, x should be a formula of the form y ~ x | g1 * g2 * ..., where x should be a numeric variable, and y

data

For the formula method, an optional data source (usually a data frame) in which variables are to be evaluated (see xyplot for details).

f.value

An optional numeric vector of probabilities, quantiles corresponding to which should be plotted. This can also be a function of a single integer (representing sample size) that returns such a numeric vector. A typical value for this argument

panel

A function, called once for each panel, that uses the packet (subset of panel variables) corresponding to the panel to create a display. The default panel function panel.qq is documented separa

qtype

The type argument for quantile.

aspect

See xyplot.

prepanel

See xyplot.

scales

See xyplot.

strip

See xyplot.

groups

See xyplot.

xlab, ylab

See xyplot.

xlim, ylim

See xyplot.

drop.unused.levels

See xyplot.

lattice.options

See xyplot.

default.scales

See xyplot.

subscripts

See xyplot.

subset

See xyplot.

default.prepanel

Fallback prepanel function. See xyplot.

...

Further arguments. See corresponding entry in xyplot for non-trivial details.

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.

Details

qq produces Q-Q plots of two samples. The default behaviour of qq is different from the corresponding S-PLUS function. See the entry for f.value for specifics.

This and all other high level Trellis functions have several arguments in common. These are extensively documented only in the help page for xyplot, which should be consulted to learn more detailed usage.

See Also

xyplot, panel.qq, qqmath, Lattice

Examples

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