Contents

Introduction
Create Manual Indicators
Update Manual Indicators
Create Automatic Indicators
Get Indicator Values
Visualization

Indicator Reference

Kaufman Efficiency Ratio

Introduction

This indicator computes the Kaufman Efficiency Ratio (KER). The Kaufman Efficiency Ratio is calculated as explained here: https://www.marketvolume.com/technicalanalysis/efficiencyratio.asp

Create Manual Indicators

You can manually create a KaufmanEfficiencyRatio indicator, so it doesn’t automatically update. Manual indicators let you update their values with any data you choose. The following reference table describes the KaufmanEfficiencyRatio constructor.

KaufmanEfficiencyRatio()1/2

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

Initializes a new instance of the KaufmanEfficiencyRatio class using the specified name and period.

KaufmanEfficiencyRatio()2/2

            KaufmanEfficiencyRatio QuantConnect.Indicators.KaufmanEfficiencyRatio (
     int  period
   )

Initializes a new instance of the KaufmanEfficiencyRatio class using the specified period.

Update Manual Indicators

You can update the indicator automatically or manually.

Automatic Update

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


private KaufmanEfficiencyRatio _ker;

// In Initialize()
_ker = new KaufmanEfficiencyRatio(name, period);
_ker.Updated += IndicatorUpdateMethod;

RegisterIndicator(symbol, _ker, Resolution.Daily);

// In IndicatorUpdateMethod()
if (_ker.IsReady)
{
    var indicatorValue = _ker.Current.Value;
}
    
# In Initialize()
self.ker = KaufmanEfficiencyRatio(name, period)
self.ker.Updated += self.IndicatorUpdateMethod

self.RegisterIndicator(symbol, self.ker, Resolution.Daily)

# In IndicatorUpdateMethod()
if self.ker.IsReady:
    indicator_value = self.ker.Current.Value

To customize the data that automatically updates the indicator, see Custom Indicator Periods and Custom Indicator Values.

Manual Update

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/decimal pair. The indicator will only be ready after you prime it with enough data.

    
private KaufmanEfficiencyRatio _ker;
private Symbol symbol;

// In Initialize()
_ker = new KaufmanEfficiencyRatio(period);
symbol = AddEquity("SPY").Symbol;

// In OnData()
if (data.ContainsKey(_symbol))
{
    _ker.Update(data[symbol].EndTime, data[symbol].High);
}
if (_ker.IsReady)
{
    var indicatorValue = _ker.Current.Value;
}
    
# In Initialize()
self.ker = KaufmanEfficiencyRatio(period)
self.symbol = self.AddEquity("SPY").Symbol

# In OnData()
if data.ContainsKey(self.symbol):
    self.ker.Update(data[self.symbol].EndTime, data[self.symbol].High)
if self.ker.IsReady:
    indicator_value = self.ker.Current.Value

Create Automatic Indicators

The KER method creates an KaufmanEfficiencyRatio indicator, sets up a consolidator to update the indicator, and then returns the indicator so you can use it in your algorithm.

The following reference table describes the KER method:

KER()1/1

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

Creates an KaufmanEfficiencyRatio indicator for the symbol. The indicator will be automatically updated on the given resolution.


If you don't provide a resolution, it defauls 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.

Get Indicator Values

To get the value of the indicator, use its Current.Value attribute.

private KaufmanEfficiencyRatio _ker;

// In Initialize()
var symbol = AddEquity("SPY").Symbol;
_ker = KER(symbol);

// In OnData()
if (_ker.IsReady)
{
    var current = _ker.Current.Value;
}
# In Initialize()
symbol = self.AddEquity("SPY").Symbol
self.ker = self.KER(symbol)

# In OnData()
if self.ker.IsReady:
    current = self.ker.Current.Value

Visualization

To plot indicator values, in the OnData event handler, call the Plot method.

private KaufmanEfficiencyRatio _ker;

// In Initialize()
var symbol = AddEquity("SPY").Symbol;
_ker = KER(symbol);

// In OnData()
if (_ker.IsReady)
{
    Plot("My Indicators", "kaufmanefficiencyratio", _ker.Current);
}
# In Initialize()
symbol = self.AddEquity("SPY").Symbol
self.ker = self.KER(symbol)

# In OnData()
if self.ker.IsReady:
    self.Plot("My Indicators", "kaufmanefficiencyratio", self.ker.Current)

For more information about plotting indicators, see Plotting Indicators.

You can also see our Videos. You can also get in touch with us via Discord.

Did you find this page helpful?

Contribute to the documentation: