Inserting Splits

Insert a split in a decision tree when you want to create a set of branches for an existing node.

You can insert a split that creates new nodes on an existing level or create a new level while creating the split. A split with branches is also known as a subtree, which can be edited, cut, copied, pasted, collapsed, or cleared.

1. Open the Tree editor in Tree view. Select the Start node or any other node where you wish to insert a split.
2. Select Edit > Insert split or select the command from the shortcut menu.
3. Complete the appropriate substeps for the predictor variable type you selected in the previous step:
4. Enter a Branch threshold value and click Add or press Enter. Repeat this for each branch threshold you wish to add. Additional thresholds for negative infinity and positive infinity are automatically added to ensure there are no gaps.

   Note: All numeric variables require you to enter branch thresholds, even if they are interpreted as categorical numeric variables.

5. Click Apply to add the branches to the decision tree.

Note: Missing values are omitted from decision tree splits.

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