| 1. | Statistical variance for the population for all values in the expression
表达式中所有值的总体方差 |
| 2. | The algorithm for finding cirtical value of normal population variance under unbiassed tests with uniform dominance
求正态总体方差的一致最优化无偏检验的临界值的算法 |
| 3. | This paper proposed an algorithm for finding critical value of normal population variance under unbiassed tests with uniform dominance
本文给出了求正态总体方差的一致最优化无偏检验的临界值的算法。 |
| 4. | Abstract : this paper proposed an algorithm for finding critical value of normal population variance under unbiassed tests with uniform dominance
文摘:本文给出了求正态总体方差的一致最优化无偏检验的临界值的算法。 |
| 5. | 2 ) the thesis proposed a priori kernel principal component analysis ( pkpca ) , which integrates between and within class variances into kpca , and thus the classification performances can be enhanced
2 )提出了一种新的具有先验类别信息的pkpca算法，通过将样本类内差和类间差融入总体方差中，从而达到更好的分类目的。 |
| 6. | 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，作者首先研究了正态总体方差的两步置信区间，并用数值计算的方法给出了第一步的最优抽样量，且证明了固定样本抽样的不存在性。 |
| 7. | The present methods for testing the large - scale corpus segmentation have the following faults : a . it is difficult to exactly estimating the variance of population ; b . the sampling quantity is too large to test the corpus segmentation . to solve the given problems , we put forward the testing method based on clustering , which sorts the sample of corpus into many group by clustering them
语料库分词质量的评价问题是汉语语料库的特有问题，已有的简单随机抽样的方法，当语料库规模变大时，无法精确估计分词质量评价中语料库样本的总体方差，同时，为了保证检验的精度，传统抽样方法的检验费用太高。 |
| 8. | Determining the sample size is crucial for a survey sampling design , for which traditional approaches have to seek some information on population variance or survey costs , however , which may result in either sample size too small and real precision undre desired level , or sample size too large and waste of survey costs
摘要样本量的确定是抽样设计中的关键问题，传统方法利用总体方差和调查费用的有关信息来确定样本量可能产生两种结果，一种是样本量过低，无法保证希望的估计精度要求；一种是样本量过高，导致调查经费的浪费。 |
