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的高次項對y的影響
E.模型參數(shù)估計的錯誤
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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(xué)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
A.原假設(shè)是精確假設(shè)
B.備擇假設(shè)是精確假設(shè)
C.原假設(shè)是非精確假設(shè)
D.備擇假設(shè)是非精確假設(shè)
E.樣本給定
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最新試題
在組距數(shù)列中,下限就是()
變量數(shù)列中,各組頻率之和應(yīng)()
If the individual class frequency is divided by the total frequency, the result is the ().
Which of the following is best to show the percentage of a total budget that is spent on each category of items?()
Which of the following statements is not true?()
某企業(yè)2018年技術(shù)工占50%,2019年新招收了一批學(xué)徒工,使學(xué)徒工的比重增加了10%。假定全廠各級工資水平均無變化,則2019年職工總平均工資將()
要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). The average number of absences per employee, calculated from the personnel data of all employees, is a ().
時間序列構(gòu)成因素有哪些?分解的基本原理和思路是什么?