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Relative Performance
Calculates the price ratio between current and selected symbols.
http://stockcharts.com/articles/mailbag/2012/01/how-can-i-chart-relative-performance-qqq-underperforms-spy-.html?st=relative+performance
http://www.wikinvest.com/wiki/Relative_performance
RelativePerformance (Instrument)
RelativePerformance (Instrument)[int barsAgo]
double
IInstrument
Relative Performance