In this paper we investigated optimal linear unbiased estimation of the linear estimable function in general multivariate random effect linear model.

本文研究了一般的随机效应多元线性模型中线性可估函数的最优线性无偏估计。

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But parameters of age, period and cohort are not uniquely estimable because of the exact linear dependency among the three variables, so many approaches have been proposed.

然而模型的三因素间存在着完全线性依赖性，使参数不能得出唯一的估计值，许多学者提出了各种方法加以解决。

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