Question: (a) Explain the relationship between -mixing and a mixingale, and discuss the appropriateness of such probabilistic assumptions for empirical modeling purposes. (b) Explain the notion

(a) Explain the relationship between ψ-mixing and a mixingale, and discuss the appropriateness of such probabilistic assumptions for empirical modeling purposes.

(b) Explain the notion of ergodicity and explain why it might be non-testable in the context of statistical models.

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