A.環(huán)比法
B.定基法
C.方程法
D.算術(shù)平均法
E.幾何平均法
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A.指數(shù)曲線趨勢(shì)模型
B.修正指數(shù)曲線趨勢(shì)模型
C.邏輯曲線趨勢(shì)模型
D.龔配茨曲線趨勢(shì)模型
E.雙指數(shù)曲線趨勢(shì)模型
A.R2=SSR/SST
B.R2=SSE/SST
C.R2=1-SSR/SST
D.R2=1-SSE/SST
E.R2=1-SSR/(SSR+SSE)
在y對(duì)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(duì)y的觀測(cè)誤差
C.對(duì)x的觀測(cè)誤差
D.x的高次項(xiàng)對(duì)y的影響
E.模型參數(shù)估計(jì)的錯(cuò)誤
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(cè)相互獨(dú)立
E.與自變量的取值相互獨(dú)立
A.1次
B.2次
C.3次
D.4次
E.5次
最新試題
A summary measure that is computed from a sample to describe a characteristic of the population is called()
時(shí)間序列構(gòu)成因素有哪些?分解的基本原理和思路是什么?
品合格率指標(biāo)是()
以2000年a0為最初水平,2016年an為最末水平,計(jì)算鋼產(chǎn)量的年平均發(fā)展速度時(shí),須開()
If the individual class frequency is divided by the total frequency, the result is the ().
在組距數(shù)列中,下限就是()
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
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?()
Which of the following is best to show the percentage of a total budget that is spent on each category of items?()
A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of ().