利用参数的最佳线性无偏估计量及最佳线性不变估计量，估计出可靠度的近似置信下限。

The approximate lower confidence bound for the reliability of the component is obtained by using Best Linear Unbiased Estimate and Best Linear Invariant Estimate for parameters.

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证明了在均方误差准则下，在该估计类中不存在一致最优不变估计，且方差分析估计是不容许估计。

It is proved that there is no best estimator in the class under mean-squared-error criterion and the Analysis-of-variance (ANOVA) estimator is also inadmissible.

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comScore估计8月份美国网络用户的搜索量与7月份相比大致维持在110.75亿不变。

ComScore estimates that the number of searches performed by U.S. Web surfers on the five top search engines was virtually unchanged at 11.75 billion searches compared with July.

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