| path.rpart {rpart} | R Documentation |
Returns a names list where each element contains the splits on the path from the root to the selected nodes.
path.rpart(tree, nodes, pretty=0, print.it=TRUE)
tree |
fitted model object of class rpart. This is assumed to be the
result of some function that produces an object with the same named
components as that returned by the rpart function.
|
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
NULL, the default, signifies using elements of letters to represent
the different factor levels.
|
print.it |
Logical. Denotes whether paths will be printed out as
nodes are interactively selected. Irrelevant if nodes
argument is supplied.
|
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 dendogram. 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 interation, the individual
paths are printed out as nodes are selected.
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.
A dendrogram of the rpart object is expected to be visible
on the graphics device, and a graphics input device (eg 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.
This function was modified from path.tree in S.
fit <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis) summary(fit) path.rpart(fit, node=c(11, 22))