Specify Column Mapping Dialog Box (Mining Accuracy Chart)
SQL Server 2008 R2
Use the Specify Column Mapping tab to select tables from an external data source and map the columns to a data mining model. You can then use the external data to test the accuracy of a mining model and displays the results in the accuracy chart.
For more information: Tools for Charting Model Accuracy (Analysis Services - Data Mining), Validating Data Mining Models (Analysis Services - Data Mining)

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