Cutlers' RSI is a variation of the original RSI Developed by Welles Wilder. This variation uses a simple moving average instead of an exponetial. Since a simple moving average is used by this variation, a longer length tends to give better results compared to a shorter length.
CALCULATION
Step1: Calculating the Gains and Losses within the chosen period.
Step2: Calculating the simple moving averages of gains and losses.
Step3: Calculating Cutler’s Relative Strength (RS). Calculated using the following: