估计两个单属性关系在连接属性上取相同值的个数的方法有两种：静态估计法和动态估计法。
There are two methods to estimate the number of the same values of two single-attribute relations in join's attribute:static estimation and dynamic estimation.
基于该融合公式，证明了在单传感器系统中，当样本观测值一定时，分组数据融合的估计效果优于单组算术平均的估计效果；
In a single sensor system when the sample amount is constant, the estimation result of data fusion to subdivided into groups is superior to arithmetic average of single group.
提出了用置信下限作为混凝土检验批强度标志值的估计量的新方法，给出了单侧容限系数的表达式。
A new method of estimating concrete strength representative value by means of a confidence lower limit is presented in this paper, and one-side tolerance factor expression is given.
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