fitted model object of class
arbor. This is assumed to be the result
of some function that produces an object with the same named
components as that returned by the
arbor function.
OPTIONAL ARGUMENTS:
splits
logical flag. If
TRUE (default), then the splits in the tree are
labeled with the criterion for the split.
label
a column name of
x$frame; values of this
will label the nodes. For the class method,
label='yval' results in the factor levels
being used, 'yprob' results in the probability of the winning factor
level being used, and 'specific yval level' results in the probability
of that factor level.
FUN
the name of a labeling function, e.g.
text.
all
Logical. If
TRUE, all nodes are labeled, otherwise just terminal nodes.
pretty
an integer denoting the extent to which factor levels in split labels
will be abbreviated. A value of (0) signifies no abbreviation. A
NULL, the default, signifies using elements of letters to represent
the different factor levels.
digits
number of significant digits to include in numerical labels.
use.n
Logical. If
TRUE (default), adds to label
(#events level1/ #events level2/etc. for
class,
n for
anova, and
# events/n for
poisson and
exp).
fancy
Logical. If
TRUE, nodes are represented by ellipses (interior nodes)
and rectangles (leaves) and labeled by
yval. The edges connecting the
nodes are labeled by left and right splits.
fwidth
Relates to option
fancy and the width of the ellipses and rectangles.
If `fwidth < 1' then it is a scaling factor (default = .8). If
`fwidth > 1' then it represents the number of character widths
(for current graphical device) to use.
fheight
Relates to option
fancy and the height of the ellipses and rectangles.
If `fheight <1' then it is a scaling factor (default = .8). If
`fheight > 1' then it represents the number of character heights
(for current graphical device) to use.
...
Graphical parameters may also be supplied as arguments to this
function (see
par).