How Geopolitical Shockwaves from Yemen Influence Model Risk and Portfolio Stress Testing
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The escalation of fighting in Yemen, combined with reports of possible new strikes on Iran, has reminded market participants that political risk can materialize abruptly and affect asset prices worldwide. For quantitative traders, such events are a reminder to embed robust stress‑testing and out‑of‑sample validation into any statistical model that drives trading signals. 1. Why Out‑of‑Sample Performance Trumps In‑Sample Fit A common pitfall in quantitative research is to celebrate a model that explains historical returns perfectly. Yet a model built on 200 observations with 20 predictors can easily capture random noise rather than genuine signal....
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