Working with nodes

Nodes are used in IBM® SPSS® Modeler to help you explore data. Various nodes in the workspace represent different objects and actions. The palette at the bottom of the IBM SPSS Modeler window contains all of the possible nodes used in stream building.

There are several types of nodes. Source nodes bring data into the stream, and are located on the Sources tab of the nodes palette. Process nodes perform operations on individual data records and fields, and can be found in the Record Ops and Field Ops tabs of the palette. Output nodes produce a variety of output for data, charts and model results, and are included on the Graphs, Output and Export tabs of the nodes palette. Modeling nodes use statistical algorithms to create model nuggets, and are located on the Modeling tab, and (if activated) the Database Modeling tab, of the nodes palette. See the topic Nodes palette for more information.

You connect the nodes to form streams which, when run, let you visualize relationships and draw conclusions. Streams are like scripts--you can save them and reuse them with different data files.

A runnable node that processes stream data is known as a terminal node. A modeling or output node is a terminal node if it is located at the end of a stream or stream branch. You cannot connect further nodes to a terminal node.

Note: You can customize the Nodes palette. See the topic Customizing the Nodes Palette for more information.