alr3 (version 1.1.12)

inf.index: 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.

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)