Time reversal and last passage time of diffusions with applications to credit risk management

Time reversal and last passage time of diffusions with applications to credit risk management
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时间反转和扩散的最后通过时间及其在信用风险管理中的应用

DOI:
10.1007/s00780-020-00423-6
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发表时间:
2020
影响因子:
1.7
通讯作者:
Rusudan Kevkhishvili
Rusudan Kevkhishvili
中科院分区:
经济学2区
文献类型:
--
作者:
Masahiko Egami;Rusudan Kevkhishvili

文献摘要

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我们研究了线性扩散的时间反演、最后通过时间和-变换。对于一般的扩散与杀戮,我们得到的概率密度的最后一次通过时间到任意水平,并分析了时间的分布,直到杀戮后的最后一次通过时间。有了这些工具,我们开发了一个新的风险管理框架的基础上的杠杆过程(公司资产过程中的比率,其债务)和相应的报警水平的公司。我们还建议公司如何通过构建相关的优化问题来确定杠杆过程的报警水平。
We study time reversal, last passage time and-transform of linear diffusions. For general diffusions with killing, we obtain the probability density of the last passage time to an arbitrary level and analyse the distribution of the time left until killing after the last passage time. With these tools, we develop a new risk management framework for companies based on the leverage process (the ratio of a company asset process over its debt) and its corresponding alarming level. We also suggest how a company can determine the alarming level for the leverage process by constructing a relevant optimisation problem.