Table 1 Accuracy of linear, separable and complete quadratic RS 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 \(R^{2}\) | 0.7962 | 0.9727 | 0.9713 |
Modified multiple fitting coefficient \(R_{\text{adj}}^{2}\) | 0.7962 | 0.9727 | 0.9713 |
Maximum relative error ζmax/% | 37.29 | 15.56 | 15.56 |
Minimum relative error ζmin/% | 10.13 | 6.56 | 6.56 |
Average relative error ζavg/% | 23.56 | 11.59 | 11.59 |