Each observation could have been weighted inversely as the distance or as the square root of the frequence.
每次观测可以倒过来加权作为距离或作为频率的平方根。
In this case optimally weighted LS estimate is not a linear estimate of a parameter given input and observation anymore and can not be compared with linear minimum variance estimate.
在这种情况下，最优加权最小二乘估计变成关于观测和输入的非线性估计，且与线性最小方差估计不可比。
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