Table 4 Accuracy of linear, separable and complete quadratic reciprocal variables RSM models for the 2-bar truss structure problem
From: Multivariate Rational Response Surface Approximation of Nodal Displacements of Truss Structures
Evaluation standards | Linear form | Separable quadratic form | Complete quadratic form |
|---|---|---|---|
Multiple fitting coefficient \(R^{2}\) | 1 | 1 | 1 |
Modified multiple fitting coefficient \(R_{\text{adj}}^{2}\) | 1 | 1 | 1 |
Maximum relative error ζmax/% | 5.78 × 10−14 | 1.68 × 10−12 | 1.13 × 10−12 |
Minimum relative error ζmin/% | 1.14 × 10−14 | 1.09 × 10−12 | 5.22 × 10−13 |
Average relative error ζavg/% | 3.38 × 10−14 | 1.40 × 10−12 | 8.21 × 10−13 |