A one-sided formula that specifies a subset of the predictors.
One component-plus-residual plot is drawn for each term. The default
~. is to plot against all numeric predictors. For example, the
specification terms = ~ . - X3 would plot against all predictors
except for X3. Factors and nonstandard predictors such as B-splines are
skipped. If this argument is a quoted name of one of the predictors, the
component-plus-residual plot is drawn for that predictor only.
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.
If layout=NA, the function does not set the layout and the user can
use the par function to control the layout, for example to have
plots from two models in the same graphics window.
ask
If TRUE, ask the user before drawing the next plot; if FALSE, the default, don't ask.
This is relevant only if not all the graphs can be drawn in one window.
main
Overall title for any array of cerers plots; if missing a default
is provided.
...
ceresPlots passes these arguments to ceresPlot.
ceresPlot passes them to plot.
variable
A quoted string giving the name of a variable for the horizontal
axis
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.
line
TRUE to plot least-squares line.
smoother
Function to add a nonparametric smooth.
smoother.args
see ScatterplotSmoothers for available
smooethers and arguments.
smooth, span
these arguments are included for backwards compatility:
if smooth=TRUE then smoother is set to loessLine,
and if span is specified, it is added to smoother.args.
col
color for points; the default is the first entry
in the current color palette (see palette
and par).
col.lines
a list of at least two colors. The first color is used for the
ls line and the second color is used for the fitted lowess line. To use
the same color for both, use, for example, col.lines=c("red", "red")
xlab,ylab
labels for the x and y axes, respectively. If not set
appropriate labels are created by the function.
pch
plotting character for points; default is 1
(a circle, see par).
lwd
line width; default is 2 (see par).
grid
If TRUE, the default, a light-gray background grid is put on the
graph
Details
Ceres plots are a generalization of component+residual (partial
residual) plots that are less prone to leakage of nonlinearity
among the predictors.
The function intended for direct use is ceresPlots.
The model cannot contain interactions, but can contain factors.
Factors may be present in the model, but Ceres plots cannot be drawn
for them.
Value
NULL. These functions are used for their side effect: producing
plots.