On Quadratic Estimates of the Interclass Variance for Unbalanced Designs
非平衡设计下组间方差的二次估计
SUMMARY The optimum properties of the popular estimate of the interclass variance in components of variance models are known if there are an equal number of observations in the subclasses. In contrast to this, it is shown that unbiased quadratic estimates having uniformly minimum variance do not exist if the design is not balanced.