This is the Relative Vigor Index (RVI) indicator described in Chapter 6.  This indicator measures the up and down strength of the market normalized to the trading range.  It may be combined with the Cyber6_RVITrigger to create a trading system.

Length = defaults to 10

Open = defaults to Open

High = defaults to High

Low = defaults to Low

Close = defaults to Close

For more information on this indicator and how to set the length parameter, refer to Chapter 6 of "Cybernetic Analysis for Stocks and Futures" by John Ehlers, Publisher: John Wiley & Sons; (March 19, 2004), ISBN: 0471463078.