Working with Nodes That Modify, Model, and Explore

Impute Missing Values

In this task, you use the Impute node to replace the missing values in the Donor data set.

Drag an Impute node from the Modify tab of the toolbar into the Diagram Workspace, and connect it to the Replacement node.
Select the Impute node in the Diagram Workspace. The Impute node property settings are displayed in the Properties panel.

For class variables, the Default Input Method property uses Count. The Count method replaces missing values with the value that is most common among all observations. The Mean method replaces missing values with the average of all the non-missing values. By default, Enterprise Miner does not impute replacement values for target variables.
Set the following properties in the Impute node Properties panel:
- In the Class Variables section, set the Default Input Method property to Tree Surrogate.
- In the Interval Variables section, set the Default Input Method property to Median.
Right-click the Impute node and select Run. When the run is complete, click OK in the Run Status window. You do not need to view the Results window now. The Impute node must run before you can use some of the features in the Transform Variables node.