Supported Indicators
Double Exponential Moving Average
Introduction
This indicator computes the Double Exponential Moving Average (DEMA). The Double Exponential Moving Average is calculated with the following formula: EMA2 = EMA(EMA(t,period),period) DEMA = 2 * EMA(t,period) - EMA2 The Generalized DEMA (GD) is calculated with the following formula: GD = (volumeFactor+1) * EMA(t,period) - volumeFactor * EMA2
To view the implementation of this indicator, see the LEAN GitHub repository.
Using DEMA Indicator
To create an automatic indicators for DoubleExponentialMovingAverage
, call the DEMA
helper method from the QCAlgorithm
class. The DEMA
method creates a DoubleExponentialMovingAverage
object, hooks it up for automatic updates, and returns it so you can used it in your algorithm. In most cases, you should call the helper method in the Initialize
method.
public class DoubleExponentialMovingAverageAlgorithm : QCAlgorithm { private Symbol _symbol; private DoubleExponentialMovingAverage _dema; public override void Initialize() { _symbol = AddEquity("SPY", Resolution.Daily).Symbol; _dema = DEMA(_symbol, 20); } public override void OnData(Slice data) { if (_dema.IsReady) { // The current value of _dema is represented by itself (_dema) // or _dema.Current.Value Plot("DoubleExponentialMovingAverage", "dema", _dema); } } }
class DoubleExponentialMovingAverageAlgorithm(QCAlgorithm): def Initialize(self) -> None: self.symbol = self.AddEquity("SPY", Resolution.Daily).Symbol self.dema = self.DEMA(self.symbol, 20) def OnData(self, slice: Slice) -> None: if self.dema.IsReady: # The current value of self.dema is represented by self.dema.Current.Value self.Plot("DoubleExponentialMovingAverage", "dema", self.dema.Current.Value)
The following reference table describes the DEMA
method:
DEMA()1/1
DoubleExponentialMovingAverage QuantConnect.Algorithm.QCAlgorithm.DEMA (Symbol
symbol,Int32
period,*Nullable<Resolution>
resolution,*Func<IBaseData, Decimal>
selector )
Creates a new DoubleExponentialMovingAverage indicator.
If you don't provide a resolution, it defaults to the security resolution. If you provide a resolution, it must be greater than or equal to the resolution of the security. For instance, if you subscribe to hourly data for a security, you should update its indicator with data that spans 1 hour or longer.
For more information about the selector argument, see Alternative Price Fields.
For more information about plotting indicators, see Plotting Indicators.
You can manually create a DoubleExponentialMovingAverage
indicator, so it doesn't automatically update. Manual indicators let you update their values with any data you choose.
Updating your indicator manually enables you to control when the indicator is updated and what data you use to update it. To manually update the indicator, call the Update
method with time/number pair, or an IndicatorDataPoint
. The indicator will only be ready after you prime it with enough data.
public class DoubleExponentialMovingAverageAlgorithm : QCAlgorithm { private Symbol _symbol; private DoubleExponentialMovingAverage _dema; public override void Initialize() { _symbol = AddEquity("SPY", Resolution.Daily).Symbol; _dema = new DoubleExponentialMovingAverage(20); } public override void OnData(Slice data) { if (data.Bars.TryGeValue(_symbol, out var bar)) { _dema.Update(bar.EndTime, bar.Close); } if (_dema.IsReady) { // The current value of _dema is represented by itself (_dema) // or _dema.Current.Value Plot("DoubleExponentialMovingAverage", "dema", _dema); } } }
class DoubleExponentialMovingAverageAlgorithm(QCAlgorithm): def Initialize(self) -> None: self.symbol = self.AddEquity("SPY", Resolution.Daily).Symbol self.dema = DoubleExponentialMovingAverage(20) def OnData(self, slice: Slice) -> None: bar = slice.Bars.get(self.symbol) if bar: self.dema.Update(bar.EndTime, bar.Close) if self.dema.IsReady: # The current value of self.dema is represented by self.dema.Current.Value self.Plot("DoubleExponentialMovingAverage", "dema", self.dema.Current.Value)
To register a manual indicator for automatic updates with the security data, call the RegisterIndicator
method.
public class DoubleExponentialMovingAverageAlgorithm : QCAlgorithm { private Symbol _symbol; private DoubleExponentialMovingAverage _dema; public override void Initialize() { _symbol = AddEquity("SPY", Resolution.Daily).Symbol; _dema = new DoubleExponentialMovingAverage(20); RegisterIndicator(_symbol, _dema, Resolution.Daily); } public override void OnData(Slice data) { if (_dema.IsReady) { // The current value of _dema is represented by itself (_dema) // or _dema.Current.Value Plot("DoubleExponentialMovingAverage", "dema", _dema); } } }
class DoubleExponentialMovingAverageAlgorithm(QCAlgorithm): def Initialize(self) -> None: self.symbol = self.AddEquity("SPY", Resolution.Daily).Symbol self.dema = DoubleExponentialMovingAverage(20) self.RegisterIndicator(self.symbol, self.dema, Resolution.Daily) def OnData(self, slice: Slice) -> None: if self.dema.IsReady: # The current value of self.dema is represented by self.dema.Current.Value self.Plot("DoubleExponentialMovingAverage", "dema", self.dema.Current.Value)
The following reference table describes the DoubleExponentialMovingAverage
constructor:
DoubleExponentialMovingAverage()1/2
DoubleExponentialMovingAverage QuantConnect.Indicators.DoubleExponentialMovingAverage (string
name,int
period,*decimal
volumeFactor )
Initializes a new instance of the DoubleExponentialMovingAverage
class using the specified name and period.
DoubleExponentialMovingAverage()2/2
DoubleExponentialMovingAverage QuantConnect.Indicators.DoubleExponentialMovingAverage (int
period,*decimal
volumeFactor )
Initializes a new instance of the DoubleExponentialMovingAverage
class using the specified period.
Visualization
The following image shows plot values of selected properties of DoubleExponentialMovingAverage
using the plotly library.
