查询词典 variance

This paper researches the improvement of the vector of unknown parameter α and the vector of random-effect parameter β, including GLSE and LSE in some conditions, discusses the relevant properties of parameter's estimation, and explains the thought of using its unbiased estimator replaced when the variance is unknown.

本文研究了未知参数向量a和随机系数β的参数估计的改进，包括在一定条件下的GLSE和LSE，并讨论了参数估计的有关性质及说明了在方差未知时，用其无偏估计代替的思想。

Necessary and sufficient conditions for equalities between a 2 y′y and minimum norm quadratic unbiased estimator of variance under the general linear model, where a 2 is a known positive number, are derived.

给出了一般线性模型下方差的最小范数二次无偏估计相等的充要条件，并且当高斯马尔可夫估计与最小二乘估计相等时，获得了一个相对简单的条件，最后给出此条件应用于抽样调查的一个例子。

As a result, the statistic feature of measurement error becomes different,and the derived rheological parameter estimation tends to be no unbiasedness and with the least variance.

钻井液流变模式的参数估计问题大多使用线性回归方法求解，然而，线性回归方法改变了测量误差的统计特征，使得所得到的流变参数估计不具有无偏性和方差最小等特点。

Like reliability, there are technical terms and issues associated with validity that are essential in helping teachers and administrators make reasonable and appropriate inferences from assessment results (e.g., types of validity evidence, validity generalization, construct underrepresentation, construct-irrelevant variance, and discriminant and convergent evidence).

象可靠性，有技术术语，并且是根本的在帮助的老师和管理员的问题与有效性相关由评估做合理和适当的推断发生(即，有效性证据、有效性概念化、修建代表名额不足、修建毫不相关的变化和有识别力和会聚证据的类型)。

The fired nerves and the unfired nerves of PCNN corresponding to pixels of image are considered as target and the background respectively. The between-cluster variance between the target and the background is calculated at each process of iteration.

在PCNN中，具有相似输入的神经元同时发生脉冲，能够弥补输入数据的空间不连贯和幅度上的微小变化，从而较完整地保留图像的区域信息，这对图像分割无疑是非常有利的。

The paper does experiment on the image restoration by using the regularized method with a variance uniformization constraint, and the results show that this method outgoes the Tikhonov regularized method.

本文利用带一致方差约束的正则化方法进行了图像恢复试验，试验结果表明该方法优于Tikhonov正则化方法。

The uniformization embeded Markov chain is used to study the sensitivity of a continuos-time Markov process. It is proved that sensitivity estimators provided by the embeded Markov chain have less variance.

提出了用一致化嵌入马氏链来研究连续时间马氏过程的灵敏度分析方法，证明了用嵌入马氏链不仅实现简单而且还可以减小灵敏度估计量的方差。

Empiric results indicate that there is a bidrectional relationship between FDI and economic growth while there is a unilateralist relationship between FDI and export; To utilize impulse response function and variance decomposition of FDI to reveal the effect of FDI on Chinese macro economy.

论文根据中国1980～2005年的时间序列数据进行实证分析：运用Granger因果关系检验方法对FDI与中国经济增长、出口的关系进行检验，发现FDI与经济增长之间存在着双向的因果关系，FDI与出口之间只存在单向的因果关系；通过VAR模型中FDI的脉冲响应函数和方差分解的方法，研究FDI对中国宏观经济的冲击作用和效果。

Example: estimating returns to education and ability is unobservable, and think the variance in ability differs by educational attainment

例子：估计教育回报并且能力不可观测，认为能力的方差随教育水平变化。

The optimal number of principal component is decided by minimizing the total unreconstructed variance in this paper.

本文选用最小不可重构方差法来选取最优主成分数。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。