查询词典 variance

The author introduces process, designs, models, hypotheses, and estimated variance component of Generalizability Theory at length on the basis of three kinds of educational test theories.

本文在简要回顾三大测量理论的基础上，较详细的阐述了概化理论的步骤、设计方案、模型和假设、方差分量估计等。

And we propose a criterion named PICa based on the adjusted profile log-likelihood function which has been used to reduce the bias of the variance component estimators.

从修正偏差的角度出发，我们采用了调整的profile似然函数作为损失函数，并基于信息论的理论基础，提出了一个新的变量选择准则PICa。

Purpose To compare restricted estimation maximum likelihood to markov chain monto carlo for genetic variance component model of quantitative trait in nuclear family.

目的 比较限制性最大似然估计和马尔可夫链蒙特卡罗方法在数量性状遗传方差分量模型中参数估计的偏差和精度。

MethodsA cluster sampling of 1 474 middle-aged intellectuals was measured by the SCL-90 table and was analyzed by the Reliability Analysis, Principal Component Analysis and Analysis of Variance.

方法采用整群抽样方法，应用症状自评量表SCL-90对1474名中年知识分子进行心理状况测评，运用尺度分析、主成分因子分析和方差分析。

Through component score coefficient and percent of variance, the weight of evaluation indexes is gained. The comprehensive index of water quality evaluation can be obtained by the coefficient of weights and standardized values of evaluation indexes, and the samples of water quality can be classified and sorted.

该模型由因子得分系数和方差贡献率确定指标权重，然后以指标权重与各水样相应指标的标准化值进行加权平均得到水质评价的综合指标值，进而对评价样本进行排序和分级。

The results indicate that the vertical component of wind velocity variance remains unchanged but the hori- zontal component increases as the sampling length increases.

结果表明：在进行湍流统计特征量计算过程中，采样长度增加时，垂直分量风速方差无明显变化，水平分量风速方差增大；随着风速的减小以及稳定度参数 z/L的增加，采样长度对计算结果的影响变得更为突出。

Longitudinal and correlated data are commonly modeled with generalized linear mixed models which contain both fixed and random effects. The source of the random effect may come from the genetic heredity, familial aggregation, or environmental heterogeneity. The inference of its variance component is usually difficult due to the dimension of its covariance matrix and the complexity of the likelihood function.

在生物医学统计中常接触到具有相关性的资料，这些相关性可能是基因、环境、重复测量或是时间所造成的；在这一类型的研究中，我们通常不只对治疗的效用有兴趣，观测值的变异以及观测值之间的相关性亦可能是我们所关注的量，这些变异或相关形式都可以被称为变异数成份。

The coefficient of component variance for high-frequency increased (p＜0.05) and low-frequency decreased (p＜0.01) in hypertensive patients with SAS after one night CPAP treatment.

活动后正常对照组和单纯高血压组Lc明显增加(p＜0.01，p＜0.01)，而SAS合并高血压组Lc却下降(p＜0.05)。一夜CPAP治疗后，SAS合并高血压组休息状态时Hc增加(p＜0.05)，Lc明显下降(p＜0.01)。

Thereby, these facts indicate that the SDE not only have better statistic properties but also have uniformly smaller mean square errors than ANOVAE in an available group of linear mixed models. The other significative following work is to generalize the idea of SDE to multivariate linear mixed model and obtain the SDE of variance component matrices which uniformly dominate the ANOVAE either.

对于含有一个随机效应的混合模型，目前文献中都仅讨论了方差分量的谱分解估计和ANOVA估计等价的充要条件，本文首次给出了方差分量的谱分解估计在均方误差意义下严格的优于ANOVA估计的理论结果，并推广到广义谱分解估计，从而说明谱分解估计不仅较ANOVA估计有更好的统计性质，而且在一类常用的模型下有更小的风险损失。

After orthostatic maneuver, the coefficient of component variance for Low-frequency component increased in healthy control subjects and patients with hypertension, decreased in hypertensive patients with SAS.

对于各频谱段变异系数在调整血压因素后协方差结果显示，与正常对照组相比，休息时SAS合并高血压组总频谱变异系数明显下降(p＜0.05)，高频段变异系数各组间无差别，与正常对照组和单纯高血压组相比，低频段变异系数明显增加(p＜0.01，p＜0.01)。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。