这一类分布族的参数估计可用无偏估计，一致最小方差无偏估计和最优线性无偏估计。
The estimation of this class of the distributed group can be done by the unbiased estimation, uniformly minimum variance estimation and the optimal linear unbiased estimation.
为了得到无偏的参数估计，本文提出一种预滤波方法。
In order to get unbiased parameter estimate, a prefiltering method is proposed.
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