总体方差

正态总体方差几类估计量的比较

Comparision the Some Estimators of the Normal Population Variance

多总体方差检验之探讨

Research on Check for Multi - Population Variance

基于总体方差最小消去DCT的方块效应

Removing DCT Blocking Effects Basd on Minimization of Total Variation

提出基于总体方差最小消去离散余弦变换DCT的方块效应，推导出水平集方程，用最小/最大曲率流替代水平集中的平均曲率流。

In this paper , minimization of total variation has been proposed via level set equation and average curvature flow has been substituted with Min / Max curvature flow .

如果仅考虑Ks或α的空间变异性，Ks或α的总体方差越大，拟单介质模型预测的水头方差准确性越差；

If considering the spatial variability of the parameter Ks or α only , the accuracy of the hydraulic head from quasi-unimodal formation becomes worse with the increase of the total variance of Ks or α;

本文利用尾部概率的估计导出了Pitman准则下一个估计优于另一估计的充分条件，并把它应用于正态总体方差估计的比较。

A sufficient condition for the superiority of one estimator over another was established under the Pitman criterion by estimating the tail probability of a random variable . The estimators of the variance in the normal distribution case were compared as an example of the applications .

关于抽样调查中总体方差预先估计法的理论分析

A Theoretical Analysis on Prior Estimation of Variance in Sample Survey

两正态总体方差比的优化置信区间

Best Confidence Interval of Ratio of Two Normal Random Variables

两总体方差差异的经验似然置信区间

Empirical Likelihood Ratio Confidence Regions for the Differences of Two Populations Variance

正态总体方差最短置信区间的研究

Study on Minimum Length of Confidence Interval for Variance of Normal Distribution

总体方差矩估计检验的样本崩溃点

The sample breakdown point of a test for moment estimation of population variance

估计总体方差时样本容量的选取

Selection of the Sample Quantity in Estimating Population Variance

两正态总体方差的最佳双边似然比检验

The Best Likelihood Ratio Test for Ratio of Variances from Two Independent Normal Populations

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。

This paper proposed an algorithm for finding critical value of normal population variance under unbiassed tests with uniform dominance .

总体方差已知条件下单个正态总体均值假设检验现行方法的缺陷与改进

Defects and Improvement of Current Methodology in Hypothesis Testing for a Single Population Mean under Normal Distribution and Known Population Variance

并给出了应用此方案时，估计总体方差σ~2应抽取的样本的最小容量。

The smallest capacity of the sample that should be take out when we estimate total square deviation when use the scheme .

产生的原因在于单位权方差与分布的总体方差不相等。

The cause is that the unit weight estimation variance and the generality variance of the distribution don 't equal with each other .

对各组心肌酶谱中各酶均值进行总体方差分析，结果为各酶的活性变化在4组均有极显著性差异（P<0.001）。

A general mean square analysis performed in every average enzyme showed markedly statistical differences among 4 groups ( P < 0.001 ) .

定义了单位权估计方差与总体方差的比值作为估计方差的可靠性指标。

This paper defines the ratio of the unit weight estimation variance and the generality variance as the reliability index of the estimation variance .

本文给出了总体方差矩估计检验的样本崩溃点，并分析了该样本崩溃点的渐近正态性。

In this paper , We give the sample breakdown point of a test for moment estimation of population variance and analyze the asymptotically normal characteristic of the sample breakdown point .

本文提出评价估计量的贴近标准，并用该标准讨论了正态分布总体方差σ2及均匀分布参数θ的极大似然估计的一些性质。

Abstract In this paper the pressing criterion of appreciation estimator was presented . and the property of maximum likelihood estimator of normal population variance σ 2 and uniformly distributed parameter θ was discussed .

数字高程模型中求趋势的一种方法&无偏最优求趋势法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。

Best Unbiased Estimator for Trend & A Method of Getting Trend of Digital Elevation Model This paper proposed an algorithm for finding critical value of normal population variance under unbiassed tests with uniform dominance .

在非线性经济计量模型的估计中，当总体方差σ2较大时，用参数线性化的逆变换代回而得的估计值不是原模型的参数估计值；

For the problem of estimation of nonlinear econometric models , when the principle variance σ 2 is relatively large , the estimates from the inverse transformation of the parameter linearization aren 't the estimated value of the original parameters .

利用两阶段抽样，我们具体给出了正态总体方差的一个置信区间，它同时满足可靠度与精度，利用数值计算的方法，我们计算出第一阶段的最优抽样量。

In this paper , we concretely design a fixed-width confidence interval for the variance σ 2 of a normal distribution N (μ,σ 2 ) by two-stage procedures and provide the optimal sample size of the first stage by numerical computations .

量表的判别效度良好，因子分析的得到3个公共因子，能解释总体方差的60.381%，各公因子在相应项目上的因子载荷均>0.5，表明该量表有较满意的结构效度。

Three common factors are extracted by factor analysis , which can account for more than 60 % of total variance and the factor loads of three common factors are above 0.5 in related items , so the questionnaire has satisfactory construct validity .

在此基础上数学界将实际工作中各种可能始点的抽样方法赋予理性思考、研究，获得结论：无限制抽样和简单随机抽样条件下样本方差是总体方差的无偏估计量。

On this basis , Mathematics circle give rational thinking and study of different sample methods In the real work and obtain the conclusion : The variance of the sample is that population variance has no estimator of leaning towards in sampling unrestrictedly and Simple random sampling .

正态总体均值方差的经验似然比置信区间估计

Empirical Likelihood Ratio Confidence Interval Estimation for Normal Population Parameters

方差分析的应用条件是各总体的方差相等。

Applying Conditions of Variance analysis are that variance of any a totality is equal to another .

两样本均来自正态总体且方差齐，记量资料组间比较采用t检验。

Two samples were come from normal population and homoscedasticity , t test was applied for difference comparison among measurement data .

假设为已知的总体标准方差，必须大于0

Is the population standard deviation for the data range and is assumed to be known . Standard_dev must be greater than 0