# Calculations Regarding Time Series Analysis

Suppose Cov(X(t), X(t-k)) = y(k) is free of t but that E(X(t)) = 3t.

(a) Is {X(t)} stationary?

(b) Let Y(t) = 7 - 3 t + X(t). Is {Y(t)} stationary?

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2.11 Suppose C0v(X,,X,_ k) = yk is free oft but that E(X,) = 3:.

(a) Is {X,} stationary?

(b) Let Y, = 7 — 3! +X,. Is {Y,} stationary?

Solution

a) In order to show that {XI} is stationary, we have to show that its mean ...

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This solution explains how to execute calculations regarding a time series analysis.

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