This node computes certain statistics between the a numeric column's values (r i ) and predicted (p i ) values. It computes R² =1-SS res /SS tot =1-Σ(p i -r i )²/Σ(r i -1/n*Σr i )² (can be negative!), mean absolute error (1/n*Σ|p i -r i |), mean squared error (1/n*Σ(p i -r i )²), root mean squared error (sqrt(1/n*Σ(p i -r i )²)), and mean signed difference (1/n*Σ(p i -r i )). The computed values can be inspected in the node's view and/or further processed using the output table.
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