Portfolio Credit Risk and the Vasicek Single-Factor Model
Free GARP FRM Part II lesson in Credit Risk Measurement and Management. 19 min read, ~2,912 words.
Default correlation drives portfolio UL above the independence benchmark. Asset-return correlation ρ from the single-factor model is much higher than default correlation between defaults. Single-factor model:. Common factor M creates correlation; idiosyncratic ε is independent across firms. Vasicek conditional default rate at confidence c:. Higher PD or higher ρ both...
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