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Table 5 Accuracy of linear, separable and complete quadratic reciprocal variables 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 \(R^{2}\)

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