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arXiv 2401.08892q-fin.RM
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信用风险压力测试模型中的虚假违约概率预测

Spurious Default Probability Projections in Credit Risk Stress Testing Models

Bernd Engelmann

AI总结:

本文揭示了信用风险压力测试模型中参数化隐含的跨周期组合会吸引当前组合向其靠拢,从而产生虚假违约率预测的问题。

摘要:

信用风险压力测试已成为一种重要的风险管理工具,既被银行内部使用,也被监管机构采用。压力测试的复杂性在于,它本质上意味着在宏观经济情景约束下,对银行完整资产负债表进行多年期的预测。部分复杂性源于使用了广泛的模型参数,例如评级迁移、核销规则、提前还款或新贷款发放等。信用风险压力测试模型的典型参数化方式设定了与平均经济状态(即跨周期状态)相关联的参数。这些参数通过利用宏观经济模型被转换为压力状态。本文将证明,模型参数化隐含着一个唯一的跨周期组合,该组合与银行当前组合无关。无论对模型施加何种压力,当前组合都将倾向于向跨周期组合传播。这可能会对预测的组合违约率产生不希望出现的虚假效应,尤其是当压力测试模型的参数化与银行当前组合不一致时。

英文摘要:

Credit risk stress testing has become an important risk management device which is used both by banks internally and by regulators. Stress testing is complex because it essentially means projecting a bank's full balance sheet conditional on a macroeconomic scenario over multiple years. Part of the complexity stems from using a wide range of model parameters for, e.g., rating transition, write-off rules, prepayment, or origination of new loans. A typical parameterization of a credit risk stress test model specifies parameters linked to an average economic, the through-the-cycle, state. These parameters are transformed to a stressed state by utilizing a macroeconomic model. It will be shown that the model parameterization implies a unique through-the-cycle portfolio which is unrelated to a bank's current portfolio. Independent of the stress imposed to the model, the current portfolio will have a tendency to propagate towards the through-the-cycle portfolio. This could create unwanted spurious effects on projected portfolio default rates especially when a stress test model's parameterization is inconsistent with a bank's current portfolio.

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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