Table 6 Accuracy of linear, separable and complete quadratic reciprocal variables RS models for the 6-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 \(R^{2}\) | 0.897 | 0.908 | 0.998 |
Modified multiple fitting coefficient \(R_{\text{adj}}^{2}\) | 0.897 | 0.908 | 0.998 |
Maximum relative error ζmax/% | 23.194 | 27 | 5.967 |
Minimum relative error ζmin/% | 7.07 × 10−4 | 3.36 × 10−3 | 3.167 × 10−4 |
Average relative error ζavg/% | 5.096 | 4.065 | 1.024 |