This is the leading indicator called NetLead described in Chapter 16.  This indicator combines a leading indicator with an exponential moving average to show when the market is in an uptrend or a downtrend.

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

alpha1 = 0.25 as described in the book

alpha2 = 0.33 as described in the book

For more information on this indicator, refer to Chapter 15 of "Cybernetic Analysis for Stocks and Futures" by John Ehlers, Publisher: John Wiley & Sons; (March 19, 2004), ISBN: 0471463078