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4. Suppose that we have observed the time series Y1, Y2, ..., Y. If the forecast error a(!) = YiHI - Yi(1) has mean zero,

4. Suppose that we have observed the time series Y1, Y2, ..., Y. If the forecast error a(!) = YiHI - Yi(1) has mean zero, then we say that the MMSE forecast Y,(1) is (a) stationary. (b) unbiased. (c) consistent. (d) complementary

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