... error of variance 误方差 quantization error， variance of 量化误差变异数 effective error variance 有效误差平方和 ...
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effective variance of error 有效误差方差
quantization error variance of 量化误差变异数
estimation of the error variance 方差的估计 ; 误差方差估计
homogeneity of error variance [统计] 误差方差的齐性
Minimum Variance-of-error estimation 方差估计
Since there is no need to suppose the variance of error, the estimation method which we established is more efficient in application.
由于在估计方法中无需假定误差方差，因此，所构造的估计方法更符合实际应用情况。
The weight matrix is replaced by using weight coefficient, and avoids calculating inverse matrix of the error variance matrix.
用计算加权系数的方法代替了原来的计算加权矩阵，从而避免了求解滤波误差方差阵的逆矩阵。
If we heighten the precision of measuring equipment, the central difference's relative error of the estimation variance improved great, which is less than 10%.
若提高测量仪表精度，则中心差分法估计方差相对值明显改善，可提高到10%以内。
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