How badly could a portfolio get hurt? What scenario would be responsible for such a loss? What are the main risk drivers in this scenario and how plausible would such a scenario be? These questions are all part of what is commonly called reverse stress testing.
This paper aims to illustrate how one could follow a very pragmatic end-to-end workflow to answer the questions above.
This technical analysis includes:
- A reverse stress test on seven different use cases across equities, rates, credit, commodity and FX strategies spanning both linear and convex portfolios
- A review of the methods used to find optimal scenarios for both linear and nonlinear portfolios
- Guidance on how to fit a Gaussian mixture to a set of factor returns
- A detailed description of different types of Lasso-based regressions techniques
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