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Seeking connections: H. Eugene Stanley, Nature 422, 819 (24 April 2003); 4/28/03 an interview with H Eugene StanleyGiven your interest in the behaviour of economic phenomena, do you have any tips for finance?HES:Pay attention to the cross-correlations between the movements of different stocks in your portfolio, and update this information regularly. This activity is not unlike those of statistical physicists, where we must pay great attention to statistical correlations between variables, and how these evolve over time.What's just around the corner?HES:Better ways of uncovering the useful, 'hidden' scientific information that seems to be carried in fluctuations; to see the connections between the different fields in which fluctuation phenomena are important, such as my recent work on connections between fluctuations in economic systems and fluctuations in systems near special 'critical points' (V. Plerou, P. Gopikishnan and H. E. Stanley Nature 421, 130; 2003).
This is fraught with trouble, because I'm sure that given the random nature of stock movements, it's very easy to see cross-correlations when there are really none there.
i don't know.....have over the years in watching my portfolio found that on really big up/down days, days with point or % change beyond 1 std deviation, that anamolous behavior (up on day market down big or vice versa) by ind'l securities is information worth paying attention to. test it in a small universe like the dow or nasdaq 100. you'll see what i mean.tr
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