The RSI (Relative Strength Index) is an oscillator that measures the percentage of positive movements compared with the absolute value of all the movements. This oscillator is normally calculated on 14 or 21 days. Since, at theScreener we provide biweekly updates, we feel the 21 day method is best for this chart. This oscillator can vary between 1.0 and 0.0. If it is 1.0, it means that 100% of the movements during 21 days were positive. If it is 0.0, it means all of the movements during the 21 days were negative.

This indicator is quite effective in stochastic or oscillating markets.