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arXiv 0710.5874math.STstat.TH
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基于局部独立性的标记点过程图模型

Graphical models for marked point processes based on local independence

Vanessa Didelez

摘要:

提出了一类新的图形模型,用于捕获随时间发生的事件的依赖结构。这些图表示所谓的局部独立性,这意味着某些类型的事件的强度与过去的一些(但不一定是所有)事件无关。这种动态的独立性概念是不对称的,类似于格兰杰非因果关系,因此相应的局部独立图与经典的图形模型有很大的不同。因此,一个新的概念图分离,称为三角洲分离,介绍和影响的基础模型,以及可能性推理进行了探讨。关于促进推理和理解的动态依赖关系,以及计算简化的好处进行了讨论。

英文摘要:

A new class of graphical models capturing the dependence structure of events that occur in time is proposed. The graphs represent so-called local independences, meaning that the intensities of certain types of events are independent of some (but not necessarily all) events in the past. This dynamic concept of independence is asymmetric, similar to Granger non-causality, so that the corresponding local independence graphs differ considerably from classical graphical models. Hence a new notion of graph separation, called delta-separation, is introduced and implications for the underlying model as well as for likelihood inference are explored. Benefits regarding facilitation of reasoning about and understanding of dynamic dependencies as well as computational simplifications are discussed.

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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