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[单选题]
下面是几个模型, 写出不满足平稳条件模型的标号:
A.Yt=0.1+0.5 Yt-1 +et
B.Yt=0.75 et-1 –0.125 et-2 +et
C.Yt= 0.44Yt-1+et
D.Yt=0.4 Yt-1+0.6 Yt-2 +et
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A.Yt=0.1+0.5 Yt-1 +et
B.Yt=0.75 et-1 –0.125 et-2 +et
C.Yt= 0.44Yt-1+et
D.Yt=0.4 Yt-1+0.6 Yt-2 +et
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