Plots vertical barplots of the var argument under each leaf of the
dendogram. The screen should be divided by tree.screens or split.screen.
USAGE:
tile.tree(tree, var, screen.arg = ascr + 1, axes = T)
REQUIRED ARGUMENTS:
tree:
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.
var:
factor to be tiled; if var is numeric, it is first quantized into four
equi-sized ordered levels.
This must have length agreeing with the data used to grow tree.
OPTIONAL ARGUMENTS:
screen.arg:
integer denoting the screen to be used for the plotting. By default
the active current screen plus 1 (the next one) is used.
See split.screen and tree.screens for more details.
axes:
logical flag: if TRUE (the default), a vertical axis is drawn at the right
edge of the barplots.
VALUE:
invisibly returns the matrix of frequency counts for the
observations in each leaf.
SIDE EFFECTS:
vertical barplots of var lined up under each leaf of the dendrogram.
The width of each tile shows the count in that level
for observations at that node.
Assumes that tree.screens
has been used to divide the graphics window.