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Which of the Following Is Not a Necessary Condition for a Variable

Question 2

Multiple Choice

Which of the following is not a necessary condition for a variable to be stationary?

A) E(y_t) = $\mu$
B) var(y_t) = $\sigma$ ²
C) cov(y_t,y_t+s) = cov(y_t,y_t-s) = $\gamma$ _s
D) E(y_t - y_t-1) = $\pi$

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