In this paper, the covariance matrix of random effect in linear mixed model is extended to positive matrix. We construct the estimation of variance components based on the idea of ANOVA estimation.
将线性混合模型中随机效应的协方差阵推广为正定阵，运用方差分析估计的方法给出了方差分量的估计。
Optimizing the software components reliability, not only need to maximize the reliability of the estimates, but also need to minimize reliability estimation variance and testing costs.
对组件软件可靠性进行优化工作时，不仅需要最大化其可靠性估计值，同时还要最小化可靠性估计方差以及测试代价。
It is known that during the side and Angle adjustment of networks, it is necessary to do the variance components estimation to make the weights of observations rational.
众所周知，边角网平差时应进行方差分量估计，以使观测权趋于合理。
It is known that during the side and Angle adjustment of networks, it is necessary to do the variance components estimation to make the weights of observations rational.
众所周知，边角网平差时应进行方差分量估计，以使观测权趋于合理。
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