DescriptionDynamics of US stock market correlations.jpg
English: The transition from normal (healthy) market behavior into abnormal seizure-like behavior at the end of 2001 (the vertical dashed line). Top is the S&P Index from March 7 2000 until March 22 2011. The third panel shows the stock correlations and the second panel shows the partial correlations (the correlations after subtraction of the Index effect. The decrease in the partial correlations manifests the abnormal dominance of the Index. This effect is further pronounced when looking at the Index Cohesive Force – the ratio between the stock correlations and the partial correlations, shown at the bottom panel
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