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arXiv 1505.01550q-fin.ST
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金融网络的动态多因素聚类

Dynamic Multi-Factor Clustering of Financial Networks

Gordon J. Ross

摘要:

我们研究了当有多个因素影响相关性结构时,金融工具形成集群的趋势。具体来说,我们考虑一个股票投资组合,其中包含来自不同行业的公司,位于几个不同的国家。部门成员和地理位置相结合,创造了一个复杂的集群结构,公司似乎首先根据部门进行划分,在每个工业部门内出现地理子集群。我们认为,标准的技术检测重叠集群和社区是无法捕捉这种类型的结构,并显示如何强大的回归技术,而不是可以用来消除行业和地理的影响,分别从相关矩阵。我们的分析显示,在2008年金融危机之前,企业并不倾向于根据地理位置形成集群。这种情况在危机发生后立即发生了变化,地理位置成为集群的一个更重要的决定因素。

英文摘要:

We investigate the tendency for financial instruments to form clusters when there are multiple factors influencing the correlation structure. Specifically, we consider a stock portfolio which contains companies from different industrial sectors, located in several different countries. Both sector membership and geography combine to create a complex clustering structure where companies seem to first be divided based on sector, with geographical subclusters emerging within each industrial sector. We argue that standard techniques for detecting overlapping clusters and communities are not able to capture this type of structure, and show how robust regression techniques can instead be used to remove the influence of both sector and geography from the correlation matrix separately. Our analysis reveals that prior to the 2008 financial crisis, companies did not tend to form clusters based on geography. This changed immediately following the crisis, with geography becoming a more important determinant of clustering.

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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