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