# Supported Indicators

## Mean Absolute Deviation

### Introduction

This indicator computes the n-period mean absolute deviation.

To create an automatic indicators for MeanAbsoluteDeviation, call the MAD helper method from the QCAlgorithm class. The MAD method creates a MeanAbsoluteDeviation 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 MeanAbsoluteDeviationAlgorithm : QCAlgorithm
{
private Symbol _symbol;

public override void Initialize()
{
}

public override void OnData(Slice data)
{
{
}
}
}
class MeanAbsoluteDeviationAlgorithm(QCAlgorithm):
def Initialize(self) -> None:

def OnData(self, slice: Slice) -> None:


The following reference table describes the MAD method:

            MeanAbsoluteDeviation QuantConnect.Algorithm.QCAlgorithm.MAD (
Symbol                           symbol,
Int32                            period,
*Nullable<Resolution>      resolution,
*Func<IBaseData, Decimal>  selector
)


Creates a new MeanAbsoluteDeviation 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.

You can manually create a MeanAbsoluteDeviation 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 MeanAbsoluteDeviationAlgorithm : QCAlgorithm
{
private Symbol _symbol;

public override void Initialize()
{
}

public override void OnData(Slice data)
{
if (data.Bars.TryGeValue(_symbol, out var bar))
{
}

{
}
}
}
class MeanAbsoluteDeviationAlgorithm(QCAlgorithm):
def Initialize(self) -> None:

def OnData(self, slice: Slice) -> None:
bar = data.Bars.get(self.symbol)
if bar:



To register a manual indicator for automatic updates with the security data, call the RegisterIndicator method.

public class MeanAbsoluteDeviationAlgorithm : QCAlgorithm
{
private Symbol _symbol;

public override void Initialize()
{
}

public override void OnData(Slice data)
{
{
}
}
}
class MeanAbsoluteDeviationAlgorithm(QCAlgorithm):
def Initialize(self) -> None:

def OnData(self, slice: Slice) -> None:


The following reference table describes the MeanAbsoluteDeviation constructor:

### MeanAbsoluteDeviation()1/2

            MeanAbsoluteDeviation QuantConnect.Indicators.MeanAbsoluteDeviation (
int  period
)


Evaluates the mean absolute deviation of samples in the lookback period.

### MeanAbsoluteDeviation()2/2

            MeanAbsoluteDeviation QuantConnect.Indicators.MeanAbsoluteDeviation (
string  name,
int     period
)


Evaluates the mean absolute deviation of samples in the look-back period.

### Visualization

The following image shows plot values of selected properties of MeanAbsoluteDeviation using the plotly library.

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