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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在y對x是線性回歸模型中,隨機誤差u產生的原因有()
A.各種細小的偶然因素
B.對y的觀測誤差
C.對x的觀測誤差
D.x的高次項對y的影響
E.模型參數(shù)估計的錯誤
A.數(shù)學期望為0
B.具有相同的方差
C.服從正態(tài)分布
D.不同次觀測相互獨立
E.與自變量的取值相互獨立
A.1次
B.2次
C.3次
D.4次
E.5次
A.數(shù)學期望為0
B.相互獨立
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
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
最新試題
Which of the following statements is not true?()
企業(yè)生產一種產品需順次經過四個車間,這四個車間的廢品率分別為1.5%、2.0%、2.0%和1.0%。該企業(yè)生產這種產品的平均廢品率是多少?
最能反映離散程度的指標是()
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the cumulative frequency of the third class?()
One rule that must always be followed in constructing frequency distributions is that ().
One advantage of a stem and leaf plot over a frequency distribution is that ().
If the individual class frequency is divided by the total frequency, the result is the ().
對某班級學生的生活狀況進行統(tǒng)計調查,下列標志中屬于不變標志的是()
Descriptive statistics deals with methods of()
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the approximate range of the number of phone calls arriving each hour?()