This components of parameter variance depends on the sample size.
参数方差的这一组成部分依赖于样本容量。
This paper deals with the variance property of combining ridge and principal components estimate in the class of reduced-dimension estimates.
讨论岭型主成分估计在一类降维估计中的方差性质，证明了它的方差和在这类降维估计中最小。
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。
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