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)), Mean signed difference (1/n*Σ(p _i -r _i )), Mean absolute percentage error 1/n * Σ((|r _i - p _i |)/ |r _i |), Adjusted R² =1-(1-R²)(n-1)/(n-p-1) (can be negative!). The computed values can be inspected in the node's view and/or further processed using the output table.