Table 1.
Database queries
| Title only | Title, abstract, and keywords* | ||||
|---|---|---|---|---|---|
| Research question 1 | |||||
| Chebyshev | AND | Machine learning | AND | Economic | |
| OR | Neural networks | OR | Financial | ||
| Sub-question 1 | |||||
| Chebyshev | AND | Approximation function | |||
| OR | Curve fitting | ||||
| OR | Interpolation | ||||
| Sub-question 2 | |||||
| Chebyshev | AND | Convergence | AND | Gradient descent | |
| Sub-question 3 | |||||
| Chebyshev | AND | Activation function | AND | Machine learning | |
| OR | Neural networks | ||||
| Sub-question 4 | |||||
| Chebyshev | AND | Jacobi | |||
| Sub-question 5 | |||||
| Chebyshev | AND | Legendre | |||
*All variants of the keywords/phrases were searched