Return data confirm what we see in the position data. I have a sample of a couple of dozen quant managers’ daily returns (some going back as far as 1997), and the average correlation of these managers to each other is 0.03. There are only nine pairs of correlations that exceed 0.20, out of 252 pairs in total. And during the heart of the crisis, from September through November 2008, this correlation was merely 0.05. By contrast, the eight HFRX hedge fund indices that have daily returns (i.e., ranging from convertibles to risk arb and macro strategies) correlate at an average of 0.21 to each other, and 11 of the 28 pairs correlate at greater than 0.20. Five of the 28 correlate at greater than 0.40, and the maximum correlation is 0.81, between the equity hedge and event‐driven styles.
Return data confirm what we see in the position data. I have a sample of a couple of dozen quant managers’ daily returns (some going back as far as 1997), and the average correlation of these managers to each other is 0.03. There are only nine pairs of correlations that exceed 0.20, out of 252 pairs in total. And during the heart of the crisis, from September through November 2008, this correlation was merely 0.05. By contrast, the eight HFRX hedge fund indices that have daily returns (i.e., ranging from convertibles to risk arb and macro strategies) correlate at an average of 0.21 to each other, and 11 of the 28 pairs correlate at greater than 0.20. Five of the 28 correlate at greater than 0.40, and the maximum correlation is 0.81, between the equity hedge and event‐driven styles.
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