A process, xt, which has a constant mean and variance, and zero autocovariance for all non-zero lags is best described as:
A. A white noise process
B. A covariance stationary process
C. An autocorrelated process
D. A moving average process
Chọn đáp án: A
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If a series, yt, follows a random walk (with no drift), what is the optimal 1-step ahead forecast for y?
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