yt=a1yt-1+a2yt-2+…+anyt-n+b0e+b1et-1+…+bmet-m，是（)。A．一阶自回归模型B．二阶自回归模型C．滑动

A.yt=a1yt-et

B.yt=a1yt-1+a2yt-2+…+akyt-k+et

C.yt=b0et+b1et-1+…bket-k

D.yt=a1yt-1+…+anyt-n+btet+b1et-1+…+bmet-m

下列模型中属于滑动平均模型的是()。

A．yt=a1yt-1+et

B．yt=a1yt-1+a2yt-2+et

C．yt=a1yt-1+a2yt-2+…+akyt-k+et

D．yt=b0et+b1et-1+…+bket-k

A.Yt=0.3+0.5Yt-1 +et+0.7et-1

B.Yt=et+et-1

C.Yt=0.2Yt-1+et

D.Yt=et-0.5et-1-0.06et-2

A.Yt=0.1+0.99Yt-1 +et

B.Yt=et -0.75et-1+0.125et-2

C.Yt= 1.2Yt-1-0.2 Yt-2+et +0.8et-1

D.Yt=0.5 Yt-1-0.06 Yt-2 +et +et-1

A.Yt / Yt-1

B.(Yt - Yt-1)/ Yt

C.(Yt - Yt-1)/ Yt-1

D.Yt - Yt-1

A.Yt / Yt-1

B.（Yt - Yt-1）/ Yt

C.（Yt - Yt-1）/ Yt-1

D.Yt - Yt-1

A.Yt / Yt-1

B.（Yt - Yt-1）/ Yt

C.（Yt - Yt-1）/ Yt-1

D.Yt - Yt-1

A.Yt=0.1+0.99Yt-1 +et

B.Yt=et -0.75et-1+0.125et-2

C.Yt= 1.2Yt-1-0.2 Yt-2+et +0.8et-1

D.Yt=0.5 Yt-1-0.06 Yt-2 +et +et-1

A.2t+3

B.2t-3

C.3t+2

D.3t-2

A.2t+3

B.2t-3

C.3t+2

D.3t-2