sample variance

Acquired conclusion was that the sample mean value submitted to normal distribution, and the sample variance was composed of a number of linear sum of random variable submitted to Chi-Squared distr.

得出的结论是:样本均值服从正态分布,样本方差由若干个服从卡方分布的随机变量的线性之和组成;样本均值的期望等于各管落点期望的算术平均值,方差为各管方差的算术平均值;样本方差是各管落点总体平均方差的无偏估计,方差与各管落点散布的差异相关;样本均值与方差相互独立的充要条件是:各管落点属于独立同分布样本。

The estimators of functions G(t) and F(t) are extended to function J(t) and the comparative study is made,including the comparison of biases,sample variances and maximal bias.

文章把关于G(t)和F(t)的估计扩展到J(t)并对其进行了比较研究,包括偏差、样本方差和最大偏离的比较。

In view of this situation, taking the samples from the entrance exam papers of art for higher education in He′nan Province in 2000 and the sample variance method and relative frequency method were used to evaluate the accuracy and stability of grading, moreover, the curve line of errors has been formed.

针对主观评分过程中存在的评分误差问题 ,从 2 0 0 0年河南省高等学校招生美术专业统考试卷中抽取样本 ,采用样本方差法与频率法对评分准确度及稳定性进行了描述与评价 ,并建立评分误差曲线 。

sample variance-covariance matrix

样本方差－协方差矩阵

Calculates variance based on the entire population (ignores logical values and text in the population)

计算基于给定的样本总体的方差（忽略样本中的逻辑值及文本）

Estimates variance based on a sample (ignores logical values and text in the sample)

估算基于给定样本的方差(忽略样本中的逻辑值及文本）

Research on the Approach of "Composite Standard Deviation" of Large Sample Created from Small Sample in Statistics of PE;

小样本合并成大样本的“组合标准差”简易求解新方法及其应用

The Limiting Spectral Density of the Sample Covariance Matrix from Causal AR(1) Model;

AR（1）模型的样本协方差阵的极限谱密度

Analyzing the difference of positive defined matrix of discrete and continuous sample;

分析离散型与连续型样本协方差阵正定性

The Applying of Heteroscedastic Sample Sampling Distribution to the Test of the Guangxi White Pig Breeding;

异方差样本的抽样分布在广西白猪育种试验中的应用

Methods The criterion of mean square error (MSE) was used to determine the pool size and the number of pools.

方法 以均方误差达到预定精度要求为准则,确定混合样本大小与混合样本量。

Deviation Control Method to Samples of Number of Eggs in Percentage of Good Eggs of Silkworm,Bombyx mori;

桑蚕种良卵率调查中样本间卵粒数的偏差控制方法

A Study on the Testing of Equal Mean & Covariance Matrix and Its Application;

双样本协方差矩阵和均值向量齐性检验的研究及其应用

Clt of Linear Spectral Statistics for Large Dimensional Sample Covariance Matrices

大维样本协方差矩阵的线性谱统计量的中心极限定理

A Modified Likelihood Ratio Test for Homogeneity in Normal Mixtures of Two Samples with an Unknown Variance

方差未知时两样本正态混合模型齐一性的修正似然比检验(英文)

covariance for simple random sampling

简单随机抽样协方差

relative variance for cluster sampling

整群抽样的相对方差

To Learn Sampling Method of Long-Tables of the Fifth Population Census of China by Looking at the Sample Error;

从抽样误差看“五普”长表抽样方法

The simple factor analysis of variance and further statistical method of multiple comparison and independent exponent t-test were used.

运用单因子方差分析及进一步的多重比较、立样本t检验的统计方法。

is the population (known) standard deviation. If omitted, the sample standard deviation is used

总体标准偏差（已知）。如果忽略，使用样本标准偏差。

Handwriting Comparison with Poor Known Samples;

样本条件较差案件的笔迹检验和体会