Widening candle ranges warn that a reversal is near.
It sums the ratio of two smoothed ranges over 25 candles. The classic reading: a rise above 27 followed by a drop below 26.5 is a 'reversal bulge'.
Worked out by the same code the builder uses, on stored daily candles. Move a setting and the line moves with it. This is what happened, not what will happen.
Gate: Mass index(25) is above 27.
It says a turn may come, never which way. Without a trend filter it is half a signal.
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