[問題] 時間序列的問題 weak/strong stationary
Let Zt be strictly stationary white noise process
(t = ..., -2, -1, 0, 1, 2, ...)
(1)Xt = a + bZt + cZt-1
(2)Xt = Z1cos(ct) + Z2sin(ct)
我想知道的是如何判斷Xt是weak stationary or strictly stationary?
感恩!!
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