Non-constant error variance or heteroscedasticity.
非常量误差方差或异方差性。
They avoid to calculate the inverse of the estimation error variance matrices, and have the generality.
它们避免了计算估计误差方差阵的逆矩阵，且具有通用性。
We study the admissibility of the quadratic estimate for error variance in two classes of growth curve model.
在二次损失函数下，研究了增长曲线模型误差方差的非齐次二次型估计的可容许性问题。
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