The Folded Relative Strength Index was created by Richard Poster (Stocks and Commodities July 2021 pg 21) and this indicator provides both trend strength but also momentum and of course reversal points using the overbought and oversold markers. If the indicator line is above the mid line then this shows upward momentum and when it falls below the midline then this means it is losing momentum. When the indicator rises above the signal line then this shows upward trend strength and vice versa. Buy when the indicator line turns green and sell when it turns red.
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