When determining empirical formula with test method, estimation value of estimated parameter in regression equation which is obtained with least square method always is a long number.
用实验方法确定经验公式时，回归方程中用最小二乘方法求得的待估参数的估计值往往是一个很长的数。
Based on effect of the impedance Angle value size in flicker calculation formula, an engineering estimation method of impedance Angle for flicker calculation is presented in this paper.
本文在考察了闪变计算公式中网络阻抗角数值大小的影响作用后，提出了一种闪变计算中阻抗角工程实用估算方法。
Indicator Kriging is a nonparametric statistical method which can make spatial estimation without abandoning peculiar value of reservoir parameters.
指示克立格是一种非参数统计方法，它能在不舍弃特异值的条件下进行有效的空间估计。
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