For a sequence of s nested models M 1 ,..., M s , model M s is

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For a sequence of s nested models M1,..., Ms, model Ms is the most complex. Let ν denote the difference in residual df between M1 and Ms.

a. Explain why for j < k, G2(M| Mk) ≤ G2(M| Ms).

b. Assume model Mj, so that Mk also holds when k > j. For all k > j, as n → ∞, P[G(Mj | Mk) > X2v (α)] ≤ α. Explain why?

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