%0 Journal Article %A Arturo Cifuentes %A Georgios Katsaros %T The One-Factor Gaussian Copula Applied To CDOs %B Just Say NO (or, If You See a Correlation Smile, She Is Laughing at Your “Results”) %D 2007 %R 10.3905/jsf.2007.698656 %J The Journal of Structured Finance %P 60-71 %V 13 %N 3 %X The one-factor Gaussian copula method has become the de facto standard to analyze most synthetic collateralized debt obligation structures. Unfortunately, this method produces a peculiar phenomenon known as a correlation smile (the implied correlation determined by the model depends on the CDO tranche one is considering instead of being tranche-independent). Market participants are divided regarding this issue. Many suspect that the correlation smile is caused by a flaw in the above-mentioned modeling strategy although they have been unable to articulate why. Others insist that the smile is actually correct and reveals important and relevant tranche-dependent characteristics, but have failed to produce convincing evidence to support this view. In this article the authors present evidence that the correlation smile is really a by-product (artifact) of an unfortunate modeling strategy and has no financial or market-driven interpretation whatsoever. Moreover, the authors argue that this modeling approach should be abandoned at once.TOPICS: CLOs, CDOs, and other structured credit, project finance, credit risk management %U https://jsf.pm-research.com/content/iijstrfin/13/3/60.full.pdf