Ensemble approach

Combining interpolation method 1, 2, …, j, …, M:

$$\hat{Z}(s_0) = \sum_{j = 1}^{M}(\hat{Z}_j(s_0) \cdot w_j)$$ With $w_j$ the weight for each method; $\sum_{j = 1}^{M}w_j = 1$