inf.index {alr3}R Documentation

Influence index plot

Description

Provides index plots of Cook's distances, leverages, Studentized residuals and outlier significance levels for a regression object.

Usage

inf.index(m,cooks.distance,rstudent,outlier.t.test,leverages,...)

## S3 method for class 'lm'
inf.index(m, cooks.distance = TRUE, rstudent = TRUE, 
    outlier.t.test = TRUE, leverages = TRUE, ...) 

Arguments

m

A regression object

cooks.distance

If TRUE, plot Cook's distances

rstudent

If TRUE, plot the Studentized residuals

outlier.t.test

If TRUE, index plot n*2*qt(-abs(rstandard),m\$df-1), the two-tailed significance levels for the outlier test based on the Bonferroni inequality

leverages

If TRUE, plot the leverages

...

Arguments passed to plot

Value

Used for its side effect of producing a graph.

Author(s)

Sanford Weisberg, sandy@stat.umn.edu

References

S. Weisberg (2005), Applied Linear Regression, third edition, Wiley, Chapter 8

See Also

cooks.distance

Examples

data(rat)
names(rat)
m1 <- lm(y~BodyWt+LiverWt+Dose,data=rat)
inf.index(m1)

[Package alr3 version 1.1.12 Index]