V. 22:5 (38-40,42): The Inverse Fisher Transform by John F. Ehlers

V. 22:5 (38-40,42): The Inverse Fisher Transform by John F. Ehlers
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The Inverse Fisher Transform by John F. Ehlers

How often have you been indecisive about entering or exiting a trade? Here’s one way to get a clear indication.

The purpose of technical indicators is to help time your decisions to buy or sell. Ideally, their signals should be clear and unequivocal, but more often than not you will find yourself crossing your fingers before pulling the trigger. Even if you have placed only a few trades, you will have experienced this.


In this article I will show you a way to program your oscillator-type indicators to give clear, black-andwhite indications of when to buy or sell. I will do this by using the inverse Fisher transform to alter the probability distribution function (PDF) of your indicators.

In the past, I have noted that the PDF of price and indicators do not have a Gaussian, or normal, probability distribution. A Gaussian PDF is the familiar bell-shaped curve in which the long “tails” mean that wide deviations from the mean do not occur frequently. The Fisher transform can be applied to almost any normalized dataset to make the resulting PDF nearly Gaussian, with the result that the turning points are sharply peaked and easy to identify.

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