Comparative Strength compares two sets of bars and calculates their ratio by dividing one by the other. Usually, a security is compared to a market index such as the S&P 500, however, you can compare any two sets of bars.
Do not confuse the Comparative Strength with the RSI (Relative Strength Index), which is an entirely different calculation and also does not compare two sets of bars.
See also Comparative Relative Strength Index, Comparative Performance and Spread.
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