Fisher Transform

הרעיון במילים פשוטות

Prices are not normally distributed, which hides turning points. The Fisher transform reshapes the price's position within its recent range so extremes become clear spikes.

איך זה מחושב

Scale the candle's midpoint into −1…+1 inside the high–low range of N candles, smooth it, and apply ½·ln((1 + x) ÷ (1 − x)). The trigger is the previous value.

x = 0.66 × ((mid − LL) ÷ (HH − LL) − 0.5) + 0.67 × x₋₁
Fisher = 0.5 × ln((1 + x) ÷ (1 − x)) + 0.5 × Fisher₋₁

איך משתמשים בזה

• Fisher crossing its trigger line marks a likely turn.
• Extreme readings (beyond ±1.5 to ±2) warn of exhaustion.

הסקת מסקנות

• Sharp, sudden turns are typical: it is designed to be decisive.

ממה להיזהר

• In strong trends it can stay extreme and give early reversal signals.

קצת היסטוריה

Introduced by John Ehlers in 2002 ("Using the Fisher Transform", Stocks & Commodities).