The variance of a random variable measures how far from the expected value its values typically are.
随机变量的方差衡量随机变量值与期望值偏离的程度。
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.
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。
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.
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。
First, we standardized the size, variance of gray scale and mean value of gray scale of the motor vehicle plate images.
首先，对机动车号牌图像进行大小、灰度方差、灰度均值的标准化处理。
An explicit functional relation of the point position variance of angular resection with observation value was derived.
推导了测角后交点位方差与观测值的显函数关系式。
The result of data testing shows that the variance of comprehensive inverse results are much less than that of interfacial depth value obtained with single geophysical field.
数据试验结果表明，综合反演结果的方差比由单一地球物理场得到的该界面深度值的方差要小得多。
Based on maximum between-cluster variance method and uniformity measure, this paper USES maximum entropy principle to select the gray-level threshold value for image segmentation.
在最大类间方差法和一致性准则法的基础上，运用最大熵原理来选择灰度阈值对图像进行分割。
On the other hand, the moment, the second moment and variance of the present value random variables about some life annuities and annuities with random interest rate are gotten.
另一方面讨论了随机利率下的一些离散年金、连续年金和连续生存年金现值随机变量的一阶和二阶原点矩及其方差。
Then, the best threshold value is calculated basing on the gradient magnitude mean and the variance of the image.
再由图像的梯度幅值均值和方差计算出图像的最佳阈值。
Errors in digital measurement of the peak value and front time of impulses are calculated by this method, with influence factors and variance ranges analysed.
利用这种方法，计算了冲击电压峰值和波前时间的数字测量误差，并分析了误差的影响因素和变动范围。
The coach's intrinsic value could separately predict 33.6%, 29.7% and 21% of variance of working in itself, working performance, and interpersonal relationship.
教练的内在价值可以分别预测其工作本身、工作表现及人际关系的变异量达33.6%、29.7%及21%。
For the regions in image where gray value is high or change intensely, local mean value and variance is adopted to control enhancement coefficients.
针对图像中的高灰度区和灰度剧变区，应用图像局部均值和方差自适应调节增强系数。
For regions with high grey-scale level or with tensely variable grey level, the image enhancement coefficients shall be adaptively controlled based on local mean value and variance.
针对图像中的高灰度区和灰度剧变区，应用图像局部均值和方差自适应调节增强系数。
The output mean value was increased and the variance was decreased by choosing suitable partial interference cancellation coefficient for MV-PIC, and its performance of code error is superior to PIC.
选择恰当的部分干扰消除系数，可以使MV-PIC的输出均值增大、方差减小、误码性能优于PIC检测器。
In the traditional financial risk measurement model, the basic method is based on normal distribution, and then the variance-covariance method used to solve the portfolio value at risk.
在传统的金融风险度量模型中，基本都是基于正态分布，然后运用方差一协方差法来求解资产组合的风险价值。
The paper concludes that earned value method can be applied in the analysis of the total cost variance in land development and consolidation projects.
研究结论：挣值法可运用于土地开发整理工程成本偏差分析。
On the basis of the classical mean-variance model, the article proposes the asset allocation model with value-at-risk constraint and transaction cost.
在经典均值-方差模型的基础上，提出了存在交易费用时基于风险价值约束的资产配置模型。
This paper proposed an algorithm for finding critical value of normal population variance under…
本文给出了求正态总体方差的一致最优化无偏检验的临界值的算法。
The final scale included 12 items and contained four dimensions:professional expectation, professional volition, professional value, and professional efficacy, with 63.053% total variance explained;
结果：师范生职业认同感量表包含职业意愿与期望、职业意志、职业价值和职业效能四个维度，累计贡献率63.053%，共12项题目；
The final scale included 12 items and contained four dimensions:professional expectation, professional volition, professional value, and professional efficacy, with 63.053% total variance explained;
结果：师范生职业认同感量表包含职业意愿与期望、职业意志、职业价值和职业效能四个维度，累计贡献率63.053%，共12项题目；
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