This is the Inverse Fisher Transform indicator described in the Ehlers’ article of the same name that appeared in the May 2004 issue of Technical Analysis of STOCKS AND COMMODITIES magazine.  He describes this indicator as an oscillator that produces clear buy and sell signals.

PriceIn - defaults to Close but change to the Price indicator to match the book

alpha – defaults to 0.07 as described in the book

For more information on this indicator, refer to Ehlers, John F. [2004].  "The Inverse Fisher Transform," Technical Analysis of STOCKS & COMMODITIES:  Volume 22:  May.