Table 2 Accuracy of linear, separable and complete quadratic RS models for the 8-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 \(R^{2}\) | 0.8132 | 0.9773 | 0.9773 |
Modified multiple fitting coefficient \(R_{\text{adj}}^{2}\) | 0.8132 | 0.9773 | 0.9773 |
Maximum relative error ζmax/% | 37.292 | 15.563 | 15.563 |
Minimum relative error ζmin/% | 0.039 6 | 2.292 × 10−4 | 2.292 × 10−4 |
Average relative error ζavg/ % | 16.096 | 4.747 | 4.747 |