leveragePlots {car}  R Documentation 
These functions display a generalization, due to Sall (1990) and Cook and Weisberg (1991), of addedvariable plots to multipledf terms in a linear model. When a term has just 1 df, the leverage plot is a rescaled version of the usual addedvariable (partialregression) plot.
leveragePlots(model, terms = ~., layout = NULL, ask, main, ...) leveragePlot(model, ...) ## S3 method for class 'lm' leveragePlot(model, term.name, id=TRUE, col=carPalette()[1], col.lines=carPalette()[2], lwd=2, xlab, ylab, main="Leverage Plot", grid=TRUE, ...) ## S3 method for class 'glm' leveragePlot(model, ...)
model 
model object produced by 
terms 
A onesided formula that specifies a subset of the numeric regressors, factors and interactions.
One addedvariable plot is drawn for each term, either a main effect or an interactions. The default

layout 
If set to a value like 
ask 
if 
xlab, ylab 
axis labels; if missing, labels will be supplied. 
main 
title for plot; if missing, a title will be supplied. 
... 
arguments passed down to method functions. 
term.name 
Quoted name of term in the model to be plotted; this argument
is omitted for 
id 
controls point identification; if 
col 
color(s) of points 
col.lines 
color of the fitted line 
lwd 
line width; default is 
grid 
If TRUE, the default, a lightgray background grid is put on the graph 
The function intended for direct use is leveragePlots
.
The model can contain factors and interactions. A leverage plot can be drawn for each term in the model, including the constant.
leveragePlot.glm
is a dummy function, which generates an error message.
NULL
. These functions are used for their side effect: producing
plots.
John Fox jfox@mcmaster.ca
Cook, R. D. and Weisberg, S. (1991). Added Variable Plots in Linear Regression. In Stahel, W. and Weisberg, S. (eds.), Directions in Robust Statistics and Diagnostics. Springer, 4760.
Fox, J. (2016) Applied Regression Analysis and Generalized Linear Models, Third Edition. Sage.
Fox, J. and Weisberg, S. (2019) An R Companion to Applied Regression, Third Edition, Sage.
Sall, J. (1990) Leverage plots for general linear hypotheses. American Statistician 44, 308–315.
leveragePlots(lm(prestige~(income+education)*type, data=Duncan))