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arXiv 1302.3564cs.AIstat.AP
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贝叶斯网络的尾部敏感性分析

Tail Sensitivity Analysis in Bayesian Networks

University of Cantabria(坎塔布里亚大学)

Enrique F. Castillo, Cristina Solares, Patricia Gomez

摘要:

本文提出了一种模拟目标变量Z=h(X)的尾部的有效方法,它依赖于一组基本变量X=(X_1,.,. X_n)。为此,变量X_i,i=1,.,n以Z=h(x_1,...,x_i-1,X_i,.,X_n)保证在Z的尾部。当这种方法难以应用时,提出了一种替代方法,与蒙特卡罗方法相比,该方法导致样本值的拒绝比例较低。这两种方法被证明是非常有用的贝叶斯网络进行敏感性分析时,需要非常大的置信区间的边际/条件概率,如在可靠性或风险分析。当所有分数一致时,这些方法表现最好。所需的修改进行了讨论。文中给出了几个算例,并以一个实际案例说明了整个过程。

英文摘要:

The paper presents an efficient method for simulating the tails of a target variable Z=h(X) which depends on a set of basic variables X=(X_1, ..., X_n). To this aim, variables X_i, i=1, ..., n are sequentially simulated in such a manner that Z=h(x_1, ..., x_i-1, X_i, ..., X_n) is guaranteed to be in the tail of Z. When this method is difficult to apply, an alternative method is proposed, which leads to a low rejection proportion of sample values, when compared with the Monte Carlo method. Both methods are shown to be very useful to perform a sensitivity analysis of Bayesian networks, when very large confidence intervals for the marginal/conditional probabilities are required, as in reliability or risk analysis. The methods are shown to behave best when all scores coincide. The required modifications for this to occur are discussed. The methods are illustrated with several examples and one example of application to a real case is used to illustrate the whole process.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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