Which non-stationary time series has a constant mean but non-constant variance?
A)random walk
B)AR(1)with linear trent
C)random walk with drift
D)deterministic trend

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The Answer of Which non-stationary time series has a constant mean but non-constant variance?
A)random walk
B)AR(1)with linear trent
C)random walk with drift
D)deterministic trend

Which Non-Stationary Time Series Has a Constant Mean but Non-Constant