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/% | 2.76 × 10−11 | 2.70 × 10−9 | 4.72 × 10−11 |
Minimum relative error ζmin/% | 9.90 × 10−12 | 4.15 × 10−14 | 5.23 × 10−13 |
Average relative error ζavg/% | 1.90 × 10−11 | 6.70 × 10−10 | 2.10 × 10−11 |