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https://www.stageanalysis.net/blog/4266/how-to-create-the-mansfield-relative-performance-indicator How to create the Mansfield Relative Strength Indicator - Stage Analysis One of the core components of Stan Weinstein's method is the use of Relative Performance compared to an index such as the S&P 500, to a sector or to another stock. Which was referred to in his book as Relative Strength. www.st..