| av.plots {car} | R Documentation |
These functions construct added-variable (also called partial-regression) plots for linear and generalized linear models.
av.plots(model, variable, ask=missing(variable), one.page=!ask, ...)
avp(...)
av.plot(model, ...)
## S3 method for class 'lm':
av.plot(model, variable,
labels=names(residuals(model)[!is.na(residuals(model))]),
identify.points=TRUE, las=par("las"), col=palette()[2], pch=1, lwd=2,
main="Added-Variable Plot", ...)
## S3 method for class 'glm':
av.plot(model, variable,
labels=names(residuals(model)[!is.na(residuals(model))]),
identify.points=TRUE, las=par("las"), col=palette()[2], pch=1, lwd=2,
main="Added-Variable Plot", type=c("Wang", "Weisberg"), ...)
model |
model object produced by lm or glm. |
variable |
variable (if it exists in the search path) or
name of variable. This argument usually is omitted for avp
or av.plots. |
ask |
if TRUE, a menu is provided in the R Console for the
user to select the term(s) to plot. |
one.page |
if TRUE (and ask=FALSE), put all plots on one
graph. |
labels |
observation names. |
identify.points |
if TRUE, then identify points interactively. |
las |
if 0, ticks labels are drawn parallel to the
axis; set to 1 for horizontal labels (see par). |
col |
color for points and lines; the default is the second entry
in the current color palette (see palette
and par). |
pch |
plotting character for points; default is 1
(a circle, see par). |
lwd |
line width; default is 2 (see par). |
main |
title for plot. |
type |
if "Wang" use the method of Wang (1985);
if "Weisberg" use the method in the Arc software associated with
Cook and Weisberg (1999). |
... |
arguments to be passed down to av.plot.lm or
av.plot.glm. |
The function intended for direct use is av.plots (for which avp
is an abbreviation). By default, these functions are used interactively
through a text menu.
The model can contain factors and interactions. An added-variable plot can be drawn for each column of the model matrix, including the constant.
NULL. These functions are used for their side effect: producing
plots.
John Fox jfox@mcmaster.ca
Cook, R. D. and Weisberg, S. (1999) Applied Regression, Including Computing and Graphics. Wiley.
Fox, J. (1997) Applied Regression, Linear Models, and Related Methods. Sage.
Wang, P C. (1985) Adding a variable in generalized linear models. Technometrics 27, 273–276.
cr.plots, ceres.plots, leverage.plots
## Not run:
av.plots(lm(prestige~income+education+type, data=Duncan))
av.plots(glm(partic != "not.work" ~ hincome + children,
data=Womenlf, family=binomial))
## End(Not run)