influencPlot

0th

Percentile

Regression Influence Plot

This function creates a "bubble" plot of studentized residuals by hat values, with the areas of the circles representing the observations proportional to Cook's distances. Vertical reference lines are drawn at twice and three times the average hat value, horizontal reference lines at -2, 0, and 2 on the studentized-residual scale.

Keywords
regression
Usage
influencePlot(model, ...)

## S3 method for class 'lm':
influencePlot(model, scale = 10, col = c(1, 2), labels = names(rstud), 
  identify.cex=par("cex"), identify.col=par("col"), ...)
Arguments
model
a linear or generalized-linear model.
scale
a factor to adjust the size of the circles.
col
colors for plotting points that do not and do have noteworthy Cook's distances.
labels
if FALSE do not identify points interactively with the mouse; otherwise a vector of observation labels.
identify.cex, identify.col
aguments to be passed to identify.
...
arguments to pass to the plot function.
Value

  • Returns the indices of identified points.

Note

This function used to be named influence.plot; the name was changed to avoid confusion with the influence generic function.

References

J. Fox (2002) An R and S-PLUS Companion to Applied Regression. Sage.

See Also

cookd, rstudent, hatvalues

Aliases
  • influencePlot
  • influencePlot.lm
  • influence.plot
Examples
influencePlot(lm(prestige ~ income + education, data=Duncan))
Documentation reproduced from package car, version 1.2-2, License: GPL version 2 or newer

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