Parameters | Expression Parameters | Sub-Feature Variable

Sub-Feature Variable
Use this field to specify the variable that distinguishes those sub-features that make up features specified in the Feature Variable field. For example, sub-feature variables might include individual probes or exons.
To Specify the Sub-Feature Variable:
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All of the variables in the specified input data set are displayed in the Available Variables field.
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Click to add the highlighted variable to the Sub-Feature Variable field, as shown below: