多項(xiàng)選擇題線性回歸模型的判定系數(shù)R2可表示為()

A.R2=SSR/SST
B.R2=SSE/SST
C.R2=1-SSR/SST
D.R2=1-SSE/SST
E.R2=1-SSR/(SSR+SSE)


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1.多項(xiàng)選擇題

在y對x是線性回歸模型中,隨機(jī)誤差u產(chǎn)生的原因有()

A.各種細(xì)小的偶然因素
B.對y的觀測誤差
C.對x的觀測誤差
D.x的高次項(xiàng)對y的影響
E.模型參數(shù)估計(jì)的錯(cuò)誤

2.多項(xiàng)選擇題根據(jù)線性回歸分析的基本假定,因變量的觀測值必須()

A.數(shù)學(xué)期望為0
B.具有相同的方差
C.服從正態(tài)分布
D.不同次觀測相互獨(dú)立
E.與自變量的取值相互獨(dú)立

4.多項(xiàng)選擇題在方差分析的數(shù)據(jù)結(jié)構(gòu)模型中,需假設(shè)隨機(jī)誤差ε()

A.數(shù)學(xué)期望為0
B.相互獨(dú)立
C.方差為常數(shù)
D.方差隨因子水平的增減而增減
E.服從正態(tài)分布

5.多項(xiàng)選擇題進(jìn)行假設(shè)檢驗(yàn)時(shí),如果要增加檢驗(yàn)的功效,則可以采用的方式有()

A.加大顯著性水平
B.減小顯著性水平
C.加大樣本容量
D.減小樣本容量
E.使用精確分布

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