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THE INVERSE FISHER TRANSFORM
By John Ehlers

The purpose of technical indicators is to help with your timing decisions to buy or sell. Hopefully, the signals are clear and unequivocal. However, more often than not your decision to pull the trigger is accompanied by crossing your fingers. Even if you have placed only a few trades you know the drill.

In this article I will show you a way to make your oscillator-type indicators make clear black-or-white indication of the time 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 where the long “tails” mean that wide deviations from the mean occur with relatively low probability. The Fisher Transform can be applied to almost any normalized data set 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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There are three spokes that make up, what I call the ?Wheel of Success? as it relates to trading. The first spoke is content. Content consists of all the external and internal market information that traders utilize to make their trading decisions. All traders must purchase value-added content that provides utility in making their trading decisions.

The most important type of content is internal market information (IMI). IMI simply is time and price information as disseminated by the exchanges. After all, we all make our trading decisions in the present tense based on time and price. In order to ?scalp? the markets effectively, we must have the most live and up-to-date time and price information seamlessly delivered to our PCs through a reliable execution platform and/or charting package. Without instantaneous time and price information, we would be trading in the dark.

The second spoke is mechanics. Mechanics is how you access the markets and the methodology that you employ to enter/exit your trades. You must master mechanics before you can enjoy any success as a trader. A simple keystroke error can result in a loss of thousands of dollars. A trader can ruin his entire day with an inadvertent trade entry error.
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