Inverse Fisher Transform RSI

The Inverse Fisher Transform RSI indicator is a momentum oscillator designed to provide clear overbought and oversold signals by applying the Inverse Fisher Transform (IFT) to the Relative Strength Index. It aims to help traders identify precise turning points by sharpening the transitions of traditional oscillator values.

Usage

The indicator is used to identify potential entry and exit points based on standardized threshold crossings. The typical interpretation follows these rules:

• Long Entry: Consider a buy signal when the indicator crosses above the -0.5 level. A secondary bullish signal occurs if the indicator crosses above the +0.5 level without having previously crossed -0.5.
• Short Entry: Consider a sell signal when the indicator crosses below the +0.5 level. A secondary bearish signal occurs if the indicator crosses below the -0.5 level without having previously crossed +0.5.

The IFT transformation makes the indicator spend more time near the extreme ends (1 and -1), making the transitions between these states very rapid and clear for trend reversal identification.

Details

Developed by John Ehlers, the Inverse Fisher Transform is applied to normalized technical indicators to provide a more definitive "binary" look at price action. In this specific implementation, the RSI is first normalized to a centered range, smoothed using a Weighted Moving Average (WMA), and then passed through the IFT formula:

(exp(2 * v) - 1) / (exp(2 * v) + 1)

This mathematical process ensures that the output values are bounded between -1 and 1. The smoothing process helps filter out market noise, while the transform ensures that the indicator reacts sharply once a significant price move is underway, reducing the ambiguity often found in traditional RSI readings.

Settings

• RSI Length: The lookback period used to calculate the underlying Relative Strength Index.
• Smoothing Length: The period for the Weighted Moving Average applied to the normalized values before the transform. Increasing this value produces a smoother line with more lag.

FAQ

How do I use the Inverse Fisher Transform RSI?

You can use it to find overbought and oversold conditions where the signals are more "snappy" than a standard RSI. Look for crosses of the -0.5 and 0.5 levels to time your entries and exits.

What is the advantage of using IFT over standard RSI?

The standard RSI often lingers in neutral zones or provides ambiguous signals. The IFT version pushes values toward the extremes, making it much easier to visualize when a trend has reached an exhaustion point or a reversal is confirmed.

How can I access this indicator?

You can get access on the LuxAlgo Library for charting platforms like TradingView, MetaTrader (MT4/MT5), and NinjaTrader for free.