Analysing correlations under stress

Analysing correlations under stress

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It is commonly recognised that correlations in a crisis vary significantly from those we observe under normal market conditions. Unfortunately, the analysis of such crisis behaviour often stops at a breezy claim that correlations all migrate to one or minus one. It certainly is true many correlations tend to shift to large absolute values in a stress situation, but this observation alone is of little value for diagnosing how a crisis might unfold. What we need to do is apply structural imaginati

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