| path.rpart {rpart} | R Documentation |
Follow Paths to Selected Nodes of an Rpart Object
Description
Returns a names list where each element contains the splits on the path from the root to the selected nodes.
Usage
path.rpart(tree, nodes, pretty = 0, print.it = TRUE)
Arguments
tree |
fitted model object of class |
nodes |
an integer vector containing indices (node numbers) of all nodes for which paths are desired. If missing, user selects nodes as described below. |
pretty |
an integer denoting the extent to which factor levels in split labels
will be abbreviated. A value of (0) signifies no abbreviation. A
|
print.it |
Logical. Denotes whether paths will be printed out as
nodes are interactively selected. Irrelevant if |
Details
The function has a required argument as an rpart object and
a list of nodes as optional arguments. Omitting a list of
nodes will cause the function to wait for the user to
select nodes from the dendrogram. It will return a list,
with one component for each node specified or selected.
The component contains the sequence of splits leading to
that node. In the graphical interaction, the individual
paths are printed out as nodes are selected.
Value
A named (by node) list, each element of which contains all the splits on the path from the root to the specified or selected nodes.
Graphical Interaction
A dendrogram of the rpart object is expected to be visible on
the graphics device, and a graphics input device (e.g. a mouse) is
required. Clicking (the selection button) on a node selects that
node. This process may be repeated any number of times. Clicking the
exit button will stop the selection process and return the list of
paths.
References
This function was modified from path.tree in S.
See Also
Examples
fit <- rpart(Kyphosis ~ Age + Number + Start, data = kyphosis)
print(fit)
path.rpart(fit, nodes = c(11, 22))