Tree Model Viewer

This selection displays a successfully built tree model.

The model viewer has three tabs as follows:

Tree

To see the rules, click the Tree tab. This tab is display by default when you double-click a tree model.

The rules are displayed in the Nodes grid.

To display leaf nodes only, click the checkbox labelled Show Leaves Only.

By default, the maximum number of levels of rules are displayed. You can change this number using the Show Levels selection to increase or decrease the number of levels displayed. To change the number of levels, click the up or down arrows next to the number of levels or select the number of levels, type the new value, and press Enter.

Two controls above the grid let you expand or contract the rules listing. To expand all rules displayed, click the icon of the arrowhead with a plus sign. To reverse the expansion, click the icon of the arrowhead with a minus sign.

To save the rules to a file, click the Save As icon (a yellow arrow above a graphic of a page) above the Nodes grid.

Examine Split Rules for Node

To examine the split rule for a node, click the Node ID.

The following information is displayed below the Nodes grid: the Predicted Target Value, Support and Confidence for the prediction, the number of Cases supporting the rule, and the Level of the rule.

Split Rules are displayed for the selected node. The default is to display Full Rule; you can also the display the Surrogate for the rule is there is one. Surrogates are used during model apply. If the antecedent of a rule is missing so the rule cannot be applied, the surrogate is used in place of the rule.

Confidence and Support

ODM calculates the following items for each tree rule:

Results

To see results, click the Results tab.

The tab contains a tree view of results. To view specific results, select the result, and click View. To delete a result, select one or more results and click Delete.

Build Settings

This tab displays the following information about how the model was built:

The following algorithm settings are displayed:

For information about Decision Tree algorithm settings, see Decision Tree Algorithm Settings.

The attributes are displayed in the Attributes grid; the following information is displayed for each attribute:

To save the attributes information as a text file, click the Save As icon (a yellow arrow above a graphic of a page) above the Attributes grid.

Task

This tab describes the task used to build the model was built and what input data was used to build the model.