Lattice prepanel function for confidence intervals

Description

This prepanel function is defined so as to allow room for all confidence intervals plotted in a lattice display. Note, both lower and upper must be passed directly to xyplot as they will be passed down to the prepanel function.

Usage

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	prepanel.ci(x,y,subscripts, lower,upper)

Arguments

x,y

Data from the call to xyplot.

subscripts

Variable used to created the juxtaposed panels.

lower, upper

95% lower and upper bounds of y.

Value

A list giving the ranges and differences in ranges of x and the lower and upper bounds of y.

Author(s)

Dave Armstrong (UW-Milwaukee, Department of Political Science)

Examples

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library(car)
library(lattice)
data(Ornstein)
mod <- lm(interlocks ~ log(assets)*nation, data=Ornstein)
mod.out <- intQualQuant(mod, c("log(assets)", "nation"), 
	n=25, plot=FALSE, type="facs")
xyplot(fit ~ x | contrast, data=mod.out, 
	xlab = "Assets", ylab = "Difference In Fitted Values", 
	lower=mod.out$lower, upper=mod.out$upper, zl=TRUE, 
	prepanel=prepanel.ci, panel=panel.ci)

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