user manual

92
Chapter 5
Map to. This method starts with the node to be introduced to the stream. First, right-click the node
to in troduce;
then, using the Data Mapping > Map To option from the pop-up menu, select th e node
to which it should join. This method is particularly useful for mapping to a terminal node. Note:
You cannot map to Merge or Append nodes. Instead, you should simply con nect the stream to the
Merge node in
the normal manner.
Figure 5-44
Selecting data mapping options
Data mapping is tightly integrated into stream building. If you try to connect to a no de that
already has a connection, you will be offered the option of replacing the connec tion or mapping to
that node.
Mapping Data to a Template
To replace the da ta source for a template stream with a new source node bringing your o wn data
into IBM® SPSS® Modeler, you should use the Select Replacement Node option from the Data
Mapping pop-up menu. This option is av ailable for all nodes except Merge, Aggregate, and all
terminal nodes. Using the data mapping tool to perform this action helps ensure that fields are
matched pro perly between the existing stream operations and the new data source. The following
steps provide an overview of the data mapping process.
Step 1: Specify essential fields in the original source node. In order for stream operations to r un
properly, essential fields sh ould be s pe cified. For more information, see the topic Specifying
Essenti al Fields on p. 94.
Step 2: Add new data source to the stream canvas. Using one of the source nodes, bring in the
new replacement data.