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1·Non-constant error variance or heteroscedasticity.

非常量误差方差或异方差性。

2·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。

3·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。

4·After that, the author focus his attention on the pure sequential confidence for the error variance in linear models.

紧接着，作者把注意力转移到线性模型误差方差的纯序贯区间估计。

5·The weight matrix is replaced by using weight coefficient, and avoids calculating inverse matrix of the error variance matrix.

用计算加权系数的方法代替了原来的计算加权矩阵，从而避免了求解滤波误差方差阵的逆矩阵。

6·At first, we analyze sample index funds' historical risk levels as well as their risk structure by means of decomposition of tracking error variance.

首先，对样本指数基金的跟踪误差方差进行分解，分析其历史风险水平；然后，引入压力测试，预测样本指数基金未来的风险水平。

7·Under the assumption of line movement with constant velocity, the flight path is built such that prediction error variance computed by the LFR times meets the specified requirements.

进一步从建立航路的的预测误差要求出发，在匀速直线运动的假设下，使用该激光重频值，激光测距的预测误差方差能达到工程要求。

8·This paper gives a necessary condition for the admissibility of a nonnegative, quadratic estimator for error variance in linear model with respect to restricted ellipsoidal parameter space.

本文给出了线性模型中椭球约束下，误差方差非负二次估计可容许的一个必要条件。

9·After the tuning of background error variance and de-correlation length, results from the NMC-method are closer to those of the innovation vector method, and the analysis results are improved.

通过对背景误差方差、特征长度的调整，显著改善了背景误差功率谱的分布特点，使得NMC方法结果与更新矢量方法结果更为吻合。

10·Then, navigation system observability and observable degree with different quantitative line-of-sight measurements are analyzed in detail by rank analysis of the error variance inverse matrix.

然后，通过对误差方差阵逆矩阵秩的分析，比较详尽地分析了不同数量视线观测条件下导航算法的可观度和可观性。