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]