要理解边界上的平均方差真正的含义是非常重要的。
It's very important to understand what the mean-variance frontier actually means.
这个例子展示了两个拥有相同长度，方差和平均单词长度的chunks。
This example shows two chunks with the same length, variance, and average word length.
图1：平均值为3且方差为1的正态分布。
3方差的专业定义是随机变量的二次中心矩，与期望值之差的平方的加权平均值。
The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.
比较了它们的平均寿命和寿命方差。
The average lifetime and lifetime variance of these systems are compared.
文章介绍了数理统计中实数或向量参数的正函数的后验平均、方差和预测密度的近似计算。
This paper introduces the approximate calculation of real number's or of vector parameter positive function's posterior mean, variance and forecasting density in mathematical statistics.
这里的最优准则是指正常应力水平下产品对数平均寿命估计的方差的极小化。
The optimum test design is obtained to minimize variance of least square estimation of the mean life at a normal stress level.
使用由方差和平均梯度构造的新的评价因子——小波邻域信息量作为融合规则选取小波高频系数。
For the image high-frequency part, use the new evaluation factor - wavelet neighborhood information to choose the ultimate wavelet high-frequency coefficients.
对于气井，在双对数坐标纸上绘出流量对平均储层压力与井筒压力平方差的关系图。
For a gas well the flow versus the difference of the squares of the average reservoir and wellbore pressures are plotted on log-log paper.
在两步估计法中，利用正交变换得到了总平均的估计，然后采用拟合常数法得到了方差的估计，并证明了该估计是无偏估计。
In two-stage estimate, used orthogonal transformation to estimate aggregate average and fitting constants method to estimate variance which was unbiased.
进而得出每种假设角色的平均值，方差及标准差验证该假设角色的存在性、出现频率的稳定性以及对各个片断的影响程度。
Furthermore, the average, variance and standard deviation are processed to testify the existence, occurrence stability and influence of each hypothetical role.
分析表明，熵、方差、对比度、差平均的性能较好。
The analysis shows that the entropy, variance, the contrast and mean error will perform better.
长期以来，通常将控制数量性状的多基因体系作为一个整体来研究，用平均值和方差来反映数量性状的遗传特征。
The polygene system which controls quantitative trait was generally studied as a whole for a long time. Average and variance were used to reflect the heredity of quantitative trait.
供应链中的某些参数，如需求、价格、成本等可能偏离供应链的预期值或者平均值，这就产生了供应链方差风险。
Some parameters chain may deviate from the expectancy value or average in the supply chain, such as demand, price, cost, and so on, and then there is a variance risk.
在第一种模型中，假定出行者的广义出行费用定义为平均行程时间和行程时间均方差的线性加权和，同时出行者能够正确认识自己的广义出行费用。
In the first model users' generalized travel cost are assumed to be weighted sum of the standard deviation and the mean travel time, and users have perfect knowledge of the road network condition.
研究了单模激光中的倍增噪声和饱和效应，导出了定态激光强度的平均值和归一化方差。
The multiplicative noise and saturation effect in a single-mode laser are investigated and the mean and normalized variance of the steady state laser intensity are calculated.
结果表明，造林密度对马尾松管胞形态总平均值影响不大，方差分析不显著；
The results show that the average value of tracheid form can not be affected by the planting density through variance analysis .
主根平均根数和侧根平均根数两个性状的遗传方差均大于环境方差，其重复力分别可达95%和87%。
Both genetic error of main and lateral root number was bigger than that of environmental error, and their repeat was 95% and 87% respectively.
测定阳性细胞数和平均光密度值，分析其变化趋势，并进行方差分析和t检验。
The number of positive cell and mean of optical density were detected and the trend change was analyzed. The variance analysis and t-test were also performed.
同时，提出的统计ss2 M模型与SPICE蒙特卡罗分析结果比较，均值的平均误差在4.16%以内，而方差的平均误差在3.06%以内。
The proposed statistical SS2M model has an average error of 4.16% with respect to SPICE Monte Carlo simulations, with an average error of standard deviation of only 3.06%.
经方差分析，两种方法嫁接成活率及成活后接穗平均生长量差异均极显著，说明红松采取劈接法嫁接优于髓心形成层贴接法。
Analysis of variance showed extremely significant on survival and COINS growth between two grafting methods, which reveals that bud grafting excelled pith-cambium grafting on Korean pine graft.
前者以组平均数为基础进行方差分析，后者以原单个数据为基础并采用KENWARDROGER法确定自由度进行分析。
The first method is to subject the cell means to an analysis of variance, the second method uses the individual observations and KENWARDROGER approximation for calculation of degree of freedom.
结果表明：祁连山附近气温在空间上具有很好的一致性，年平均气温的第一主成分的方差贡献可占总方差的75%左右。
The results show temperature spatial variations have high consistency, the variance ratio contribution of the first principal component is about 75%.
基于模糊逻辑，无偏最小方差估计(UMVE)和单元平均(CA)提出一种新的恒虚警检测器(FUCAP)。
False Alarm Rate (CFAR) detector (FUCAP) based on Fuzzy logic, Unbiased Minimum-Variance Estimation (UMVE) and Cell Averaging (CA) is presented in this paper.
通过计算机模拟，针对改进的漏桶法对信元丢失率、信元平均延迟、信元延迟方差带来的影响进行了定量的分析。
Through the computer simulation, a quantitative analysis is given about the influence that the modified model brings to the cell losing ratio, the cell average delay and the average delay variance.
结果表明，此方法报准率较高，平均误差与均方差较小。
The results show that this method has a high success rate with smaller average error.
本文计算了亚洲500毫巴月平均环流指数的方差谱。
In this paper, the power spectrum of the monthly 500 MB circulation index over Asia has been calculated.
采用最小方差理论和平均原理对自适应滤波算法进行分析，对信号中产生的延时和相移予以有效补偿。
By using minimum variance and average principle, the adaptive filtering algorithm is analyzed to effectively compensate the time-delay and phase shift that appear in signals.
文中首先给出了杂交模式的裂纹尖端奇异单元的刚度矩阵，然后基于随机场的局部平均理论和一阶泰勒展开得到了应力强度因子均值和方差的计算公式。
The stiffness matrix of a hybrid crack-tip singular element is first derived, then by use of first-order Taylor expansion the mean and variance of stress intensity factors are formulated.
方差为各组日平均增重与相应对照组的方差。
Note :Variance stands for the variance of daily weight gain of each group and corresponding control group .
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