查询词典 variance ratio test

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Manufactures and markets test equipment products include: Programmable constant temperature and humidity testing machine, constant temperature and humidity box, high and low temperature testing machine, high-temperature box, cold temperature testing machine, hot and cold impact testing machine, the temperature cycling chamber, salt spray test machine, corrosion test chamber, the aging test machine, a large environmental test chamber, high temperature aging rooms, environmental test chamber, UV weathering test chamber, vibration, drop test machine, temperature water tank, clamshell laptop life testing machine, keyslife testing machine, testing machine drop life test simulation environment test equipment.

伟煌试验设备有限公司生产和销售的产品包括：可程式恒温恒湿试验机，恒温恒湿箱，高低温试验机，高低温箱，低温耐寒试验机，冷热冲击试验机，温度循环试验箱，盐水喷雾试验机，耐腐蚀试验箱，老化试验机，大型环境试验室，高温老化房，环境试验室，紫外线耐候试验箱，振动，跌落试验机，恒温水槽，笔记本翻盖寿命测试机，按键寿命测试机，跌落寿命测试试验机等模拟环境试验设备。

Friday, rubber, plastics, rubber adhesive tape test series grinding test machine, wear test machine, wear testing machine, folding machine, foam compression stress test machine, foam plastic repeated compression test machines, test material removed machine, Determination of the plastic melt index machine, impact testing machine, heating distortion temperature testing machine, falling ball impact test machine, rigid plastic drop hammer impact test machine, plastic film drop hammer impact testing machine, high temperature ashing furnace, temperature testing machine tape retention, Tape retention test machine, the beginning of sticky tape ball test machine, color device, industrial projectors, coordinate measuring instrument.

五、橡胶、塑胶、胶带试验系列橡胶胶磨试验机、磨耗试验机、耐磨试验机、耐折试验机、泡棉压缩应力试验机、发泡塑反复压缩试验机、试料磨平机、塑胶熔融指数测定机、冲击试验机、加热变形温度试验机、落球冲击试验机、硬质塑胶落锤冲击试验机、塑胶膜落锤冲击试验机、高温灰化炉、恒温胶带保持力试验机、胶带保持力试验机、胶带初粘性滚球试验机、色差仪、工业投影仪、三座标测量仪。

And then some ellipses that AUGR estimator is better than the OLS estimator and AUGL estimator is better than the OLS estimator are given, respectively.Second, the definition of the almost unbiased unified biased estimator is proposed. This definition includes the familiar almost unbiased estimators in literatures, and it is the unified expression of the familiar almost unbiased estimators. Followed the biased and variance are compared of AUUB estimator and the unified biased estimator, respectively. AUUB estimator has smaller bias than UB estimator and the variance of AUUB estimator is between the variance of UB estimator and 4 times of the variance of UB estimator. Finally the properties of AUUB estimator are discussed. The conclusion is gained that there are parameters made AUUB estimator is better than OLS estimator in terms of their mean square error. The sufficient and necessary condition that AUUB estimator is admissible is given. The ellipse is given that AUUB estimator is

然后给出了几乎无偏统一有偏估计的定义，该定义包括了文献中常见的几乎无偏估计，实现了常见几乎无偏估计的统一表达式；接下来我们比较了几乎无偏统一有偏估计与统一有偏估计的偏度与方差，得出了几乎无偏统一有偏估计比统一有偏估计有较小的偏度，几乎无偏统一有偏估计的方差介于统一有偏估计的方差与统一有偏估计的方差的四倍之间的结论；最后我们对统一有偏估计的主要性质作了讨论，证明了存在参数K，S使得几乎无偏统一有偏估计在均方误差意义下优于最小二乘估计的结论，给出了几乎无偏统一有偏估计为可容许估计的充要条件，还给出了在均方误差阵意义下几乎无偏统一有偏估计优于最小二乘估计的椭球。

By the look of content of the difference, the cost variance has had direct material cost variance, artificial cost variance and cost variance of the manufacturing expense directly.

从差异的内容看，成本差异有直接材料成本差异、直接人工成本差异和制造费用成本差异。

This article first discusses the significance of homogeneity of variance, then studies the general method of transformation for homogeneity of variance on the relation between the data mean and the variance when population distribution is known ,and it uses the Mathematica software to analyse the variety rules between the parameter and the variance in the corresponding transformation.

从方差非齐性数据处理中的变换的必要性入手，根据数据均值与方差之间的关系研究了总体分布已知时的方差齐性变换的一般方法，并利用Mathematica软件分析相应变换中参数与方差之间的图形规律，最后介绍了总体分布未知时的BoxCox变换的一般原理。

Therefore, just like the direct material variance, when the labor cost for a task differs from standard, the direct labor variance can be divided into a labor efficiency variance and a labor rate variance.

正像直接材料差异那样，对一项工作的实际成本与标准成本之间的比较，直接人工成本也可以分成工时量差异和工资率差异两部分来分析。

The measurement system error model analysis is introduced into power system real time network state analysis as an important part for the first time, which can improve on the state estimation quality and provide the capability to monitor the operation of the measurement system; 2. The theory and algorithm of the on-line estimation and update of measurement noise variance based on the relation between the residual variance and noise variance. The statistic properties of the sample variance are discussed and the relation between the estimation precision and sample size under given confidence level is derived; 3. The theory and algorithm of detection and identification of measurement bias are presented, which is based on the relation between residual mean and noise mean. The statistic properties of sample mean are discussed and the relation between estimation precision and sample size is derived; 4. The Givens orthogonal transformation algorithm is selected to be the essential algorithm of state estimation, the fast orthogonal transformation algorithm with damp factor and the algorithm which can handle the zero injection measurements efficiently are presented; 5. The quantity analysis theory of bad data detectivity and identifibility are presented, which describes the relation between the elements in matrix W〓 and bad data amplitude and can provide the theory base for measurement system design and valuation.

一、首次将量测系统误差模型分析做为一个环节引入电力系统实时网络状态分析中，为EMS系统增加了实时监视系统运行、修正量测系统误差模型的新功能，进一步发挥了实时网络状态分析应用软件的潜力；二、首次提出了应用样本方差在线估计与修正量测系统误差方差的基本理论，讨论了样本方差的统计性质和概率分布，推导出了样本容量、估计精度和置信度之间的关系，给出了在线估计与修正量测系统误差方差的算法；三、首次提出了应用样本均值在线检测与辨识量测偏差的基本理论，讨论了样本均值的统计性质，推导了样本容量、估计精度和置信度之间的基本关系，给出了在线检测与辨识量测偏差的算法；四、在状态估计算法设计中，以Givens变换算法做为基本算法，提出了快速正交变换阻尼因子法和可以有效地处理零注入量测的混合法，并对实时应用中的一些问题进行了讨论；五、提出了不良数据可检测性与可辨识性的定量分析理论，揭示了描述量测系统配置、网络结构与参数的残差灵敏度矩阵中的元素与不良数据的幅值在可检测、可辨识能力上的定量关系，为量测系统配置设计与评价提供了理论基础；六、综合国内外最新研究成果，采用自适应自回归预测技术和稀疏矢量技术，构造了较完善的不良数据检测与辨识算法。

Based on the researches of system factors, system characters and the influence of market structure to market behavior, the chapter points out the characteristics and rules of china bond market system variance. On account of the Promoting Effect Government Dominated behavior, compellent system variance runs through the evolution of market structure and act on it. Although derivational system variance also works, it can't be the dominant because of the long variance time and high cost.

根据制度变迁理论研究债券市场结构的制度成因、特点及其对于市场结构和行为的影响，指出中国债券市场制度变迁的特点和规律，由于在中国债券市场的发展过程中，政府主导行为具有明显推动效应，强制性制度变迁始终贯穿于市场结构演变的过程中，并对其形成重要作用；诱致性制度变迁虽然也穿插其中，但由于其变迁时间长、成本高等特点，无法形成主导力量。

In each subperiod,the static rank variance and the static density variance of the population are defined,thus the DMOPs is transformed into several bi-objective static optimization problems by using the static rank variance and the static density variance.

然后把动态多目标优化问题近似地转化成了若干个两个目标的静态优化问题。在给出的一种能自动检测环境变化的应答算子下，提出了一种动态多目标进化算法，同时证明了算法的收敛性。

The witness also told the jury at the Royal Courts of Justice in London that he saw a paparazzo fighting with a member of the public who was trying to stop him taking pictures in the minutes before the emergency services arrived.

他还告诉在伦敦皇家法庭的陪审团，在急救服务到来之前，他当时看见一个狗仔队正和一群阻止他拍照的人打架。

The entire N／C program on a tape is made up of an accumulation of these successive data blocks.

纸带上的整个数控程序由这些连续数据单元连接而成。