two-stage sample 中文意思是什麼
two-stage sample
解釋
兩階段樣品-
Firstly, by numerical and theoretical analysis, the author compares some existent confidence intervals, for example, " exact " confidence interval, wald confidence interval and bayesian confidence interval, and finds some deficiencies points of the confidence intervals, whose modification version has been proposed. also, several better confidence intervals such as are also presented. secondly, for given confidence coefficient and interval width, the author constructs a class of asymptotical two - stage interval estimate procedures. at the same time, under varies restriction of confidence coefflcientent interval width, the optional sample size of the first stage has been computed by numerical computation. the numerical computation shows that the method considered in this dissertation have good properties and applied value
同時，由於poisson分佈的特性，我們知道不存在其參數區間長度小於0 . 5的置信區間，基於這些情況，我們主要展開了以下兩個方面的研究：一是利用數值計算分析與理論分析的方法對現有的若干置信區間如「精確」置信區間， wald置信區間， bayes置信區間等進行分析比較，發現了一些缺陷，針對這些缺陷，我們進行適當的修正，並得到幾種性質較好的置信區間如：修正大樣本區間jeffreys原則下置信區間二是針對已給定的置信系數與區間長度，我們提出了一種漸近的兩階段區間估計程序，並利用數值計算的方法，在各種置信系數與區間長度限定下，算出了最優的第一階段觀測次數（抽樣量） ，大量數據表明，本文考慮的方法性態良好，具有應用價值。 -
In chapter 1, the author first study the two - stage confidece intervals for the variance of a normal distribution, then work out the optimal sample size of the first stage by numerical computations and establish a proof for the non - existence of fixed - size sampling
在第1章里，作者首先研究了正態總體方差的兩步置信區間，並用數值計算的方法給出了第一步的最優抽樣量，且證明了固定樣本抽樣的不存在性。 -
After doing two - stage study, i. e. pilot study and large sample study, and testing the reliability and the validity of variables in this paper, we conclude that level of amt has positive impacts on level of quality management and level of quality management has positive impacts on enterprise performance. although level of amt has no positive impacts on enterprise performance, it has indirect effects on enterprise performance through the mediating function of quality management
經過小樣本調查與大樣本調查兩個階段並對變量指標的可靠性與有效性進行分析后，我們得出結論認為先進製造技術水平對企業質量管理水平有著顯著的正向影響，企業質量管理水平對企業的績效水平有著顯著的正向影響，而雖然先進製造技術水平對企業的績效並無顯著的影響，但通過與質量管理工作的共同作用，它對企業績效還是有著一定的間接影響。
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