For instance, the three sigma long system works when the sigma over progressively longer time horizons is rising showing that a stock's move is becoming more and more abnormal, yet rising. When this happens, stocks tend to continue their rise. I also studied the opposite as a sigma starts out high and then begins to show weakness over progressively longer time horizons.
The Three Sigma Long System is posted at www.foursigmatrading.com and I expect to have the short system up and running shortly.
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