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coplot {base}R Documentation

Conditioning Plots

Description

This function produces two variants of the conditioning plots discussed in the reference below.

Usage

coplot(formula, data, given.values, panel = points, rows, columns,
       show.given = TRUE, col = par("fg"), pch = par("pch"), ...)
co.intervals(x, number = 6, overlap = 0.5)

Arguments

formula

a formula describing the form of conditioning plot. A formula of the form y ~ x | a indicates that plots of y versus x should be produced conditional on the variable a. A formula of the form y ~ x| a * b indicates that plots of y versus x should be produced conditional on the two variables a and b.

x and lang(y) must be numeric, but a and b may be either numeric or factors.

data

a data frame containing values for any variables in the formula. By default the environment where coplot was called from is used.

given.values

a value or list of two values which determine how the conditioning on a and b is to take place. Usually this is a matrix with two columns which each row of which gives and interval, to be conditioned on, but is can also be a single vector of numbers or a set of factor levels (if the variable being conditioned on is a factor).

panel

a function which gives the action to be carried out in each panel of the display. The default is points.

rows

the panels of the plot are laid out in a rows by columns array. rows gives the number of rows in the array.

columns

the number of columns in the panel layout array.

show.given

should conditioning plots be shown for the conditioning variables (default TRUE)

.

col

a vector of colors to be used to plot the points. If too short, the values are recycled.

pch

a vector of plotting symbols or characters. If too short, the values are recycyled.

...

additional arguments to the panel function.

number

the number conditioning intervals.

overlap

the fraction of overlap of the conditioning variables.

References

Cleveland, W. S. (1993). Visualizing Data. New Jersey: Summit Press.

See Also

pairs, panel.smooth, points.

Examples

## Tonga Trench Earthquakes
data(quakes)
coplot(long ~ lat | depth, data = quakes)
coplot(long ~ lat | depth * mag, data = quakes)
[Package base version 0.60 ]