sample variance
英 [ˈsɑːmpl ˈveəriəns]
美 [ˈsæmpl ˈveriəns]
样本方差，样品方差；采样方差
双语例句
- The estimates are the convex combinations of prior variance and sample variance.
这种估计实际上是先验方差与样本方差的凸组合。 - Selection of the Sample Quantity in Estimating Population Variance
估计总体方差时样本容量的选取 - By using maximum likelihood method, the friction factor and estimate value of sample variance are obtained, and the interval estimation of the friction factor is gotten.
按极大似然法原理计算出三种规格的预制直埋供热管和回填砂的摩擦系数以及样本方差的估计值，并按照摩擦系数和样本方差的估计值进行了摩擦系数的区间估计。 - Further, considered the considerable uncertainty of current sample variance, a reliability estimation method based on t-distribution theory and empirical logarithmic standard deviation is proposed.
进一步考虑到工程实际中当次可靠性试验的样本方差具有较大不确定性的因素，提出了基于对数标准差经验值的t分布可靠性评估方法。 - 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.
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。 - Based on these expansions, the empirical Bayes estimator is shown to have smaller mean squared error than the customary variance estimator, i. e., the within group sample variance, if N is large.
基于这些展开式，在N很大时证明了经验Bayes估计要比常用方差估计（组内样本方差）有更小的均方误差。 - The paper is based on the Fourier series and use the Chebyshev polynomials wonderfully, gives successfully the distribution and calculation of the sample generalized variance.
本文以傅氏级数为基础，巧妙地利用了契贝谢夫多项式，成功地给出了子样广义方差的分布函数及其计算过程。 - This paper is to research the simple way of datum-changing sample average and variance.
本文是在对样本求完其均值和方差后，数据又有所变动后的样本均值和样本方差的简易求法加以研究。 - A Sample Survey Method and the Variance of the Estimate on the Sensitive Question of the Finite Population
有限总体下敏感性问题的抽样调查方法与误差估计 - With lower water: sample ratio the variance of element concentration ratios is greater;
水∶物的比值较低时，元素浓度比值变化较大； - The mode of the distribution was found to be mainly related with the control sample size while the variance of the distribution largely determined by the case sample size.
而分布的方差则主要取决于患病者样本量大小。 - Small Sample Comparison of Two Usual Variance Estimators of the Ratio Estimator
比估计的两个常用的方差估计量的小样本比较 - Recurrence Formula of Sample Variance of K Order
子样方差K阶递推公式 - In this paper, the problem of importance sampling by minimizing the sample variance is studied and the computational formula for the determination of the optimum parameters in the normal distribution function is presented.
本文研究了以抽样方差最小为条件的重要抽样问题，给出正态抽样分布函数有关参数的计算公式。 - The random weighing approximation for the error of sample variance estimator and the application of random weighing method to sample surveys
方差估计的随机加权逼近及随机加权法在抽样调查中的初步应用 - The expression to estimate confidence interval of normal distribution mean-value: which was deduced with knowing variance ( large sample) and unknowing variance ( smallsample).
方差已知（或大样本）、方差未知（或小样本）的情况下的数据融合方法估计正态分布母体均值的置信区间。 - Other complex sampling methods often based on the results of a simple random sampling. For different sampling methods with the same sample size, the estimator variance of the population mean becomes an important sign to measure the accuracy of any sampling methods.
其他复杂的抽样方法常以简单随机抽样为基础，对于相同的样本容量条件下不同的抽样方法来说，总体均值估计量的方差就成为衡量各种抽样方法的有效程度的重要标志。 - These indirect samples are first calculated based on the direct ones in some textbooks, and then the sample averages and its variance are calculated based on the indirect samples.
文章所针对的教材都用直接样本先计算出间接样本，再用间接样本计算样本均值及其方差。 - These indirect samples have some statistical relationship with each other, but when calculating sample variance and average variance, the variance formula of random samples are used, so a wrong result is deduced.
这样的间接样本是统计相关的，可是上述教材在计算样本方差和样本均值的方差时，又用了随机样本的方差公式，所以结果是错误的。 - And to this questionnaire for the tool, through the independent sample t test, analysis of variance, correlation analysis and regression analysis method of master graduate student internship status, employment tendency and employment conditions, and the relationship between the three.
并以此问卷为工具，通过独立样本t检验、方差分析、相关分析、回归分析等方法研究了硕士研究生的实习状况、择业倾向和就业状况，以及三者之间的关系。 - The parameters 'approximate values are ensured by the average value of several estimate, and the sample number is ensured by the variance coefficient.
通过多次估计的均值作为参数的近似值，采样的样本数通过方差系数确定。 - The relationships between the process parameters and the surface quality during forming multi-tracks and thin walls were studied by the use of sample variance analysis method.
此外，本文还采用样本方差分析方法研究了单层结构和薄壁墙零件的表面质量与工艺参数的关系，并根据单层结构对实体成型的影响优化了实体成型的工艺参数。 - Based on the separation work of continuous sample path variance and discrete jump variance, heterogeneous autoregressive ( HAR) model is used here for volatility modeling and forecasting.
在将波动率当中的连续样本路径方差和离散跳跃方差有效地分离开后，文章选用异质自回归类（HAR）模型来对波动率建模预测。 - Governmental administration of the rural financial developmental factor reaches the level of 20.07%, but the sample variance is quite small, which shows that the role of the governmental administration of the rural financial development is more stable and should not be overlooked.
政府行政行为对农村金融发展的影响度只有20.07%的水平，但其样本方差小，说明政府行政行为对农村金融发展的影响作用比较稳定，不容小视。 - By constructing the neighborhood graph and non-neighborhood graph, DVE deals with the sample variance distinguishingly, that maximizes the global variance and simultaneously preserves the local variance.
通过构造数据集的近邻图和非近邻图，DVE算法对样本方差采取了不同的处理方式，使低维表示全局方差最大的同时保持局部方差不变。 - The data were analyzed with SPSS 13.0 by descriptive analysis and independent sample t test and anaylsis of variance, multiple factor linear regression and pearson correlation analysis and Logistic regression analysis and so on.
数据使用SPSS13.0进行描述性分析、独立样本t检验、方差分析、多元线性回归分析、相关分析和Logistic回归分析等。 - Disturbed by random selection within a certain number of particles in the sample, calculate the sample mean and variance of the target space, which is proposed for the maximization and minimization problems of the robust model ofa single target, and extended to multiple targets. 4.
通过随机选取粒子扰动范围内一定数量的样本，计算出样本目标空间的均值和方差，由此提出了针对最大化和最小化问题的鲁棒模型，并推广到多个目标的优化命题。 - However, the establishment of the linear regression equation bases on large sample of events, and the variance of the residuals? ε i-i.i.d. ( 0,σ 2).
然而线性回归方程是建立在大样本的事件的基础之上，且残差的方差εi～i.i.d.（0，σ2）。 - Firstly, I used independent sample T examination and single factor variance to analyze and compare distributive features among different groups of university students on employment anxious.
通过独立样本T检验和单因素方差来分析比较就业焦虑在不同大学生群体中的分布特点，并归纳出其中的主要成因和次要成因。