avPlots {car} | R Documentation |
These functions construct added-variable (also called partial-regression) plots for linear and generalized linear models.
avPlots(model, terms= ~ ., intercept=FALSE, layout=NULL, ask, main, ...) avp(...) avPlot(model, ...) ## S3 method for class 'lm' avPlot(model, variable, id.method = list(abs(residuals(model, type="pearson")), "x"), labels, id.n= if(id.method[1]=="identify") Inf else 0, id.cex=1, id.col=palette()[1], col = palette()[1], col.lines = palette()[2], xlab, ylab, pch = 1, lwd = 2, main="Added-variable Plot", grid=TRUE, ...) ## S3 method for class 'glm' avPlot(model, variable, id.method = list(abs(residuals(model, type="pearson")), "x"), labels, id.n=if(id.method[1]=="identify") Inf else 0, id.cex=1, id.col=palette()[1], col = palette()[1], col.lines = palette()[2], xlab, ylab, pch = 1, lwd = 2, type=c("Wang", "Weisberg"), main="Added-variable Plot", grid=TRUE, ...)
model |
model object produced by lm or glm .
|
terms |
A one-sided formula that specifies a subset of the predictors.
One added-variable plot is drawn for each term. For example, the
specification terms = ~.-X3 would plot against all terms
except for X3 . If this argument is a quoted name of one of the terms, the
added-variable plot is drawn for that term only.
|
intercept |
Include the intercept in the plots; default is FALSE . |
variable |
A quoted string giving the name of a regressor in the model matrix for the horizontal axis |
layout |
If set to a value like c(1,1) or c(4,3) , the layout
of the graph will have this many rows and columns. If not set, the program will
select an appropriate layout. If the number of graphs exceed nine, you must
select the layout yourself, or you will get a maximum of nine per page. |
main |
The title of the plot; if missing, one will be supplied. |
ask |
If TRUE , ask the user before drawing the next plot; if FALSE don't ask.
|
... |
avPlots passes these arguments to avPlot .
avPlot passes them to plot .
|
id.method,labels,id.n,id.cex,id.col |
Arguments for the labelling of
points. The default is id.n=0 for labeling no points. See
showLabels for details of these arguments.
|
col |
color for points; the default is the second entry
in the current color palette (see palette
and par ). |
col.lines |
color for the fitted line. |
pch |
plotting character for points; default is 1
(a circle, see par ). |
lwd |
line width; default is 2 (see par ). |
xlab |
x-axis label. If omitted a label will be constructed. |
ylab |
y-axis label. If omitted a label will be constructed. |
type |
if "Wang" use the method of Wang (1985);
if "Weisberg" use the method in the Arc software associated with
Cook and Weisberg (1999) |
grid |
If TRUE, the default, a light-gray background grid is put on the graph |
The function intended for direct use is avPlots
(for which avp
is an abbreviation).
NULL
. These functions are used for their side effect: producing
plots.
John Fox jfox@mcmaster.ca, Sanford Weisberg sandy@umn.edu
Cook, R. D. and Weisberg, S. (1999) Applied Regression, Including Computing and Graphics. Wiley.
Fox, J. (2008) Applied Regression Analysis and Generalized Linear Models, Second Edition. Sage.
Fox, J. and Weisberg, S. (2011) An R Companion to Applied Regression, Second Edition, Sage.
Wang, P C. (1985) Adding a variable in generalized linear models. Technometrics 27, 273–276.
Weisberg, S. (2005) Applied Linear Regression, Third Edition, Wiley.
residualPlots
, crPlots
, ceresPlots
,
avPlots(lm(prestige~income+education+type, data=Duncan)) avPlots(glm(partic != "not.work" ~ hincome + children, data=Womenlf, family=binomial))