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arXiv 1906.01468stat.APecon.EMmath.OCstat.CO
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基于图因果模型的压力测试网络重构

Stress Testing Network Reconstruction via Graphical Causal Model

Helder Rojas, David Dias

摘要:

金融资产组合的弹性最优评估意味着对宏观经济变量和风险参数之间的多重相互关系有合理的假设。在本文中,我们提出了一个图形模型的因果结构的重建,连接多个宏观经济变量和评估的风险参数,这是我们称之为压力测试网络(Stress Testing Network)的结构。在这个模型中,宏观经济变量和风险参数之间的关系在它们的时间序列之间定义了一个"关系图",其中相关的时间序列通过边连接。我们的建议是基于时间因果模型,但与此不同的是,我们在结构中加入了特定的条件,这些条件对应于这种类型的网络的内在特征。使用所提出的模型并考虑到问题的高维性质,我们使用正则化方法来有效地检测时间序列中的因果关系并重建潜在的因果结构。此外,我们还举例说明了模型在投资组合信用风险数据中的应用。最后,我们讨论了它在压力测试中的用途和实际好处。

英文摘要:

An resilience optimal evaluation of financial portfolios implies having plausible hypotheses about the multiple interconnections between the macroeconomic variables and the risk parameters. In this paper, we propose a graphical model for the reconstruction of the causal structure that links the multiple macroeconomic variables and the assessed risk parameters, it is this structure that we call Stress Testing Network (STN). In this model, the relationships between the macroeconomic variables and the risk parameter define a "relational graph" among their time-series, where related time-series are connected by an edge. Our proposal is based on the temporal causal models, but unlike, we incorporate specific conditions in the structure which correspond to intrinsic characteristics this type of networks. Using the proposed model and given the high-dimensional nature of the problem, we used regularization methods to efficiently detect causality in the time-series and reconstruct the underlying causal structure. In addition, we illustrate the use of model in credit risk data of a portfolio. Finally, we discuss its uses and practical benefits in stress testing.

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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