Question: Exercise 12.5 Show that d is approximately equal to 2(1 ra), where ra is the sample (auto)correlation between the pairs ( ei+1, ei )

Exercise 12.5 Show that d is approximately equal to 2(1 − ra), where ra is the sample (auto)correlation between the pairs ( ˆei+1, ˆei ) i = 1, . . . , n − 1.

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