The Ensemble node in SAS^® Enterprise Miner™ creates new models by combining the posterior probabilities or the predicted values from multiple predecessor models. The new model is then used to score new data. However, when you run the Ensemble node, errors such as the following might be displayed in the node log:

WARNING: Apparent symbolic reference EM_SCORE_OUTPUT not resolved.
ERROR: File WORK.EM_SCORE_OUTPUT.DATA does not exist.

The error is displayed if one or more of the predecessor nodes produces score code that includes non-DATA step code. The Ensemble node is designed to work with nodes that produce only DATA step code.

To view score code for a node, run the node, and view the results. In the Results browser, select View ► Scoring ► SAS Code. Examples of non-DATA step statements include procedure or macro invocations.

To avoid the error, remove from the flow any predecessor node that produces non-DATA step score code. One common way to avoid such predecessor nodes is to break the flow into two parts when possible.

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