Why has my tree stopped growing?

The tree is stopped from growing by the Stopping Conditions specified in the Algorithm Options. For a full explanation of these see How do I set the Stopping Conditions? and How do I set the Algorithm Options?

In addition there are some fundamental reasons why a particular node will be stopped from growing:

• A node cannot be split using a dimension for which all people in the node have the same value. For example, if everyone in a node is Male, then clearly the node cannot be split using Gender. If this is true of all the dimensions being considered in the analysis, then the node will be stopped from growing.
• A node in which all or none of the people belong to the analysis selection cannot be split. This will be flagged as “Too Sparse to Split".

Diagnose a stopped node¶

In the Tree Grid view, use the Stopping Reason column to understand why a particular node has been stopped.

In the Next Split view, use the Reason If Invalid column to understand why a particular dimension has not been used to split a node.