We resort to expectation maximization (EM) algorithm for both the estimation of model parameters and the coping with missing values.

这里，期望最大化算法既用来处理丢失值又用来估计模型参数。

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The sensitivity of the model to various values of the stratification parameters that influence vertical diffusion has been studied and some preliminary results presented.

研究了计算模型对影响垂直扩散的不同层化参数值的敏感性，提供了一些初步结果。

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To improve the technique, both the values of parameters in physical model of electromigration and the statistic distribution property of the parameters are needed.

要改进该技术，不仅需要确定可靠性物理模型参数，而且要求掌握参数的统计分布特性。

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