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\name{infIndexPlot}
\alias{infIndexPlot}
\alias{influenceIndexPlot}
\alias{infIndexPlot.lm}
\title{Influence Index Plot}
\description{
Provides index plots of Cook's distances,
leverages, Studentized residuals, and outlier significance levels for a
regression object.
}
\usage{
infIndexPlot(model, ...)
influenceIndexPlot(model, ...)
\method{infIndexPlot}{lm}(model,
vars=c("Cook", "Studentized", "Bonf", "hat"),
main="Diagnostic Plots",
labels, id.method = "y",
id.n = if(id.method[1]=="identify") Inf else 0,
id.cex=1, id.col=palette()[1], id.location="lr", grid=TRUE, ...)
}
\arguments{
\item{model}{A regression object of class \code{lm} or \code{glm}.}
\item{vars}{
All the quantities listed in this argument are plotted. Use \code{"Cook"}
for Cook's distances, \code{"Studentized"} for Studentized
residuals, \code{"Bonf"} for Bonferroni p-values for an outlier test, and
and \code{"hat"} for hat-values (or leverages). Capitalization is optional.
All may be abbreviated by the first one or more letters.
}
\item{main}{main title for graph}
\item{id.method,labels,id.n,id.cex,id.col,id.location}{Arguments for the labelling of
points. The default is \code{id.n=0} for labeling no points. See
\code{\link{showLabels}} for details of these arguments.
}
\item{grid}{If TRUE, the default, a light-gray background grid is put on the
graph}
\item{\dots}{Arguments passed to \code{plot}}
}
\value{
Used for its side effect of producing a graph. Produces four index plots
of Cook's distance, Studentized Residuals, the corresponding Bonferroni
p-values for outlier tests, and leverages.
}
\references{
Cook, R. D. and Weisberg, S. (1999)
\emph{Applied Regression, Including Computing and Graphics.} Wiley.
Fox, J. (2008)
\emph{Applied Regression Analysis and Generalized Linear Models},
Second Edition. Sage.
Fox, J. and Weisberg, S. (2011)
\emph{An R Companion to Applied Regression}, Second Edition, Sage.
Weisberg, S. (2014)
\emph{Applied Linear Regression}, Fourth Edition, Wiley.
}
\author{Sanford Weisberg, \email{sandy@umn.edu}}
\seealso{ \code{\link{cooks.distance}}, \code{\link{rstudent}},
\code{\link{outlierTest}}, \code{\link{hatvalues}} }
\examples{
m1 <- lm(prestige ~ income + education + type, Duncan)
influenceIndexPlot(m1)
}
\keyword{ hplot }% at least one, from doc/KEYWORDS
\keyword{ regression }% __ONLY ONE__ keyword per line
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