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This page contains the formula for RSI and you can download the formula in Excel file.
Relative Strength Index (RSI) was introduced by J. Welles Wilder back in 1978, the RSI is a very popular and useful momentum oscillator. RSI ranges from 0 to 100 after comparing the magnitude of a stock's recent gains to the magnitude of its recent losses. In Wilder's book New Concepts in Technical Trading System, he recommended to use 14 periods as the parameter.
Relative Strength Index (RSI)
Formula:
RSI = 100 - (100 / (1 + RS)) RS = AG / AL
RS is Relative Strength AG is Average Gain AL is Average Loss
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