Counting and Recounting Decision Trees

Tree counting occurs automatically the first time you change the node view to Counts or Counts-labels in the Tree View, or the first time you select the Profile View or Leaf View during the current session of the decision tree.

Counting, and later recounting, ensures that statistics are available for the various views.

Once a decision tree is counted initially, all subsequent recounts, in all views, must be performed manually.

Count a tree by changing the node view.

Note For illustrative purposes, all the drop-down menus are expanded at the same time.

These decision tree views include:

• TREE: Edit and refine your tree, with the following options:
  • Display counts or counts-label:
    • COMPACT: displays decision node values without statistics (default view). This view always appears when you open a tree, even if you had selected COUNTS or COUNTS-LABEL in a previous session.
    • COUNTS: displays decision node values, as well as the total number of counts and weighted percent of total.
    • COUNTS-LABEL: displays decision node values, as well as the total number of counts and weighted percent of total with their respective labels, #T and W%T.
  • Color decision nodes:
    • No Color is the default.
    • Treatments shows the proportion of treatments per node, based on your existing treatment colors.

      Note If display counts is set to COMPACT and you select Color by > Treatments, display counts is automatically set to COUNTS.

    • Target: <target variable>, where <target variable> represents the name of the target variable in the tree. This view shows the proportion of target outcomes per node, based on the default target definition colors.

      Note If display counts is set to COMPACT and you select Color by > Target: <target variable>, display counts is automatically set to COUNTS.

• PROFILE: Profile the nodes of your tree and the target variable (for target-driven decision trees).
• LEAF: Analyze treatments using leaf node statistics.
• TREATMENTS: View and analyze a summary of treatments.

Note When you select Counts or Counts-labels, the Proportion and Recount buttons appear in the decision tree toolbar.

If you have not specified which profiling variables you are interested in, you will be prompted to do so when a tree count requires it; just select one or more variables presented from the drop-down list.

When you modify your tree, such as editing or inserting splits, or merging rows, you will need to click Recount to update the count. Alternatively, you can right-click a decision node and select Trigger recount.

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