This is the Center of Gravity (CG) oscillator indicator described in Chapter 5.  Ehlers describes this smoothed, zero lag indicator as useful for identifying turning points.  It may be combined with the Cyber5_CGTrigger indicator to create a trading system.

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

Length – defaults to 8 but Ehlers’ also uses a value of 10.  This indicator is very sensitive to the length parameter

For more information on this indicator and a discussion on how to set the length parameter, refer to Chapter 5 of "Cybernetic Analysis for Stocks and Futures" by John Ehlers, Publisher: John Wiley & Sons; (March 19, 2004), ISBN: 0471463078.