Posted by Mohammad Rahhal, Last modified by Rawan Al Hourani on 15 June 2016 02:35 PM
The Welles Wilder's Smoothing indicator is similar to an exponential moving average.
The indicator does not use the standard exponential moving average formula. Welles Wilder described 1/14 of today's data + 13/14 of yesterday's average
as a 14-day exponential moving average.
Returns the handles of a technical indicator, in case of failure returns an empty string.