对应于方差参数这两种估计的回归系数的两种两步估计，它们的均方误差大致相当。

However, two-stage estimates of regression coefficients corresponding to these two estimates have approximate equal mean square error.

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对因子设计而言，现已有若干种不同方法来估计实验误差方差。

For fractional factorial designs several different approaches to estimate this variance have been suggested.

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目的通过估计误差方差阵，对多传感器组合导航系统中不同的融合数据进行定位精度比较，为系统定位提供选择数据的依据。

Aim Using the variance matrix of estimated error, positional accuracy can be compared with different mixing together data, it has put forward a kind of basis for system location to select data.

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