This menu can be used to form a classification tree.
Available Data
This lists data structures appropriate to the current input field. The contents will change as you move from one
field to the next. Double-click on a name to copy it to the current input field; alternatively, you can type the
name directly into the input field.
Groups
Provides a space for you to specify a factor for the groupings of the individuals in the tree.
X-Variables
Specifies the independent (x) variables available for constructing the tree. The
button allows multiple selections to be
copied from Available Data.
Save Tree in:
Specifies an identifier name to save the resulting tree in. The tree will be saved within a GenStat Tree data structure.
Prune
The construction of a classification tree generally results in over fitting, that is it continues to extend the branches
of the tree beyond the point that can be justified statistically. One solution is to prune the tree to remove
the uninformative sub-branches. Clicking this button opens a menu where you can prune the tree.
See Also