Plot a Tree Sequence

DESCRIPTION:

Allows the user to plot a tree sequence.

USAGE:

plot.tree.sequence(x, ..., order="increasing") 

REQUIRED ARGUMENTS:

x
object of class "tree.sequence". This is assumed to be the result of some function that produces an object with the same named components (size, deviance, k) as that returned by prune.tree and shrink.tree.

OPTIONAL ARGUMENTS:

order
character string describing the order of size on the plot. Use "decreasing" for the natural ordering of k and the amount of pruning. Only the first character is needed.

SIDE EFFECTS:

plots deviance or number of misclassifications versus size for a sequence of trees.

DETAILS:

This function is a method for the generic function for class tree.sequence. It can be invoked by calling for an object x of the appropriate class, or directly by calling regardless of the class of the object.

SEE ALSO:

, , , .

EXAMPLES:

z <- tree(Mileage ~ Weight, car.test.frame) 
zp <- prune.tree(z) 
plot(zp, type="s") # stairstep plot 
zs <- shrink.tree(z) 
lines(zs$size, zs$dev)