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Business, 21.02.2020 23:31 desstinee863

Autocorrelation functions of covariance stationary series. While interviewing at a top investment bank, your interviewer is im- pressed by the fact that you have taken, a course on forecasting. She decides to test your knowledge of the autocovariance structure of covari- ance stationary series and lists five autocovariance functions:
a. γ(t, r) = α
b, γ(t, r) =e^-ar
d. γ(t, τ)=ατ ,
where α is a positive constant, which autocovariance function(s) are consistent with covariance stationarity, and which are not? Why?

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