edit.tree(object, node, var, splitl, splitr = NULL)

object:

fitted model object of class tree. This is assumed to be the result of some function that produces an object with the same named components as that returned by the tree function.

node:

number of the node to edit. Specifically, node is a row from a component of the output of burl.tree.

var:

character string giving the variable to split on at the supplied node.

splitl:

left split. For continuous variables, the numeric value of the split. For factors, a character string of levels. For example, if levels 2 and 4 should go left, splitl is "bd".

splitr:

right split (only required if var is a factor). A character string of levels that go right.

f.cu <- formula(Reliability ~ Price + Country + Mileage + Type)

#edit node 3 to split on Price < 13000
z.cu <- tree(f.cu, cu.summary, na.action = na.tree.replace)
z.edit <- edit.tree(z.cu, 3, "Price", 13000)

#compute alternative splits at node 3
tree.screens()
b3 <- burl.tree(z.cu, 3)

#edit z.cu according to the 6th split on Country
z.edit <- edit.tree(z.cu, b3$Country[6, ])