Usage Rules for Nodes

Here are some general rules that govern the placement of nodes in a process flow diagram:

The Input Data Source node cannot be preceded by any other node.
All nodes except the Input Data Source and SAS Code nodes must be preceded by a node that exports a data set.
The SAS Code node can be defined in any stage of the process flow diagram. It does not require an input data set that is defined in the Input Data Source node.
The Model Comparison node must be preceded by one or more modeling nodes.
The Score node must be preceded by a node that produces score code. For example, the modeling nodes produce score code.
The Ensemble node must be preceded by a modeling node.
The Replacement node must follow a node that exports a data set, such as a Data Source, Sample, or Data Partition node.