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。
The average size is 3,131 square feet, with a standard deviation of 655 square feet. (Standard deviation is a statistical measure of variance.)
平均大小为 3,131平方英尺，标准偏差为 655 平方英尺（标准偏差是一个描述差异的统计量度）。
The standard deviation is the square root of the variance.
标准差是方差的平方根。
But the system variance is going to be on the order of the square root of N times epsilon.
但是系统能量的变化量大约,会是N的平方根乘以ε
The optional polynomial order is selected through the test of the partial fitting square sum on the basis of the variance analysis of the fitting equation.
对拟合方程进行方差分析并在此基础上利用偏拟合平方和的检验确定拟合多项式的最佳阶数。
The optimum test design is obtained to minimize variance of least square estimation of the mean life at a normal stress level.
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。
With covariance matching technique and innovation information of filtering, the noise variance is dynamically adjusted and the mean square error of the fusion system always keeps minimum.
该算法采用协方差匹配技术，依据滤波新息，动态调整测量噪声方差，使融合系统的均方误差始终最小。
When the noise variance is known, and it's process is stationary, the signal can be enhanced by use of the recursive least mean-square estimation.
当噪声的方差已知，且过程是平稳的，应用递推最小方差估计，能够增强信号。
The positive square root of the variance is called the standard deviation.
方差的正的平方根叫做标准差。
Introduces the principle of Variance addition and sets forth the related problems on calculating the mean-square deviation in practical application.
介绍方差相加原理，阐述均方差计算在实际应用中的有关问题。
SPSS17.0 statistical software for statistical analysis, Measurement data using analysis of variance, calculators information is chi-square test.
使用SPSS17.0统计软件进行统计分析，计量资料采用方差分析，计数资料采用卡方检验。
It revealed that the product of the standard deviation of the estimated sampling variance and square root of the number of samples was a constant.
实验也证明，取样方差估计值的标准偏差与样本数目的平方根之积可近似为一常数。
In the present paper, We give the necessary and sufficient conditions for which the minimum variance linear unbiased estimator reduces to the least square in multivariate linear models.
本文讨论回归方程组系数的估计，给出最小二乘估计是有效估计的条件。
In the present paper, We give the necessary and sufficient conditions for which the minimum variance linear unbiased estimator reduces to the least square in multivariate linear models.
本文讨论回归方程组系数的估计，给出最小二乘估计是有效估计的条件。
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