/// <summary>
/// Chaikin oscillator as described here:
/// <see href="https://en.wikipedia.org/wiki/Accumulation/distribution_index"/>
/// </summary>
/// <param name="series">input time series</param>
/// <param name="parentId">caller cache id, optional</param>
/// <param name="memberName">caller's member name, optional</param>
/// <param name="lineNumber">caller line number, optional</param>
/// <returns>accumulation/ distribution index as time series</returns>
public static ITimeSeries <double> ChaikinOscillator(this Instrument series,
CacheId parentId = null, [CallerMemberName] string memberName = "", [CallerLineNumber] int lineNumber = 0)
{
var cacheId = new CacheId(parentId, memberName, lineNumber,
series.GetHashCode());
var adl = series.AccumulationDistributionIndex(cacheId);
return(adl
.EMA(3, cacheId)
.Subtract(
adl
.EMA(10, cacheId),
cacheId));
}