Supported Indicators

Relative Strength Index

Introduction

This indicator represents the Relative Strength Index (RSI) developed by K. Welles Wilder. You can optionally specified a different moving average type to be used in the computation

To view the implementation of this indicator, see the LEAN GitHub repository.

Using RSI Indicator

To create an automatic indicator for RelativeStrengthIndex, call the RSIrsi helper method from the QCAlgorithm class. The RSIrsi method creates a RelativeStrengthIndex 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 Initializeinitialize method.

public class RelativeStrengthIndexAlgorithm : QCAlgorithm
{
    private Symbol _symbol;
    private RelativeStrengthIndex _rsi;

    public override void Initialize()
    {
        _symbol = AddEquity("SPY", Resolution.Daily).Symbol;
        _rsi = RSI(_symbol, 14);
    }

    public override void OnData(Slice data)
    {

        if (_rsi.IsReady)
        {
            // The current value of _rsi is represented by itself (_rsi)
            // or _rsi.Current.Value
            Plot("RelativeStrengthIndex", "rsi", _rsi);
            // Plot all properties of abands
            Plot("RelativeStrengthIndex", "averageloss", _rsi.AverageLoss);
            Plot("RelativeStrengthIndex", "averagegain", _rsi.AverageGain);
        }
    }
}
class RelativeStrengthIndexAlgorithm(QCAlgorithm):
    def initialize(self) -> None:
        self._symbol = self.add_equity("SPY", Resolution.DAILY).symbol
        self._rsi = self.rsi(self._symbol, 14)

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

        if self._rsi.is_ready:
            # The current value of self._rsi is represented by self._rsi.current.value
            self.plot("RelativeStrengthIndex", "rsi", self._rsi.current.value)
            # Plot all attributes of self._rsi
            self.plot("RelativeStrengthIndex", "average_loss", self._rsi.average_loss.current.value)
            self.plot("RelativeStrengthIndex", "average_gain", self._rsi.average_gain.current.value)

For more information about this method, see the QCAlgorithm classQCAlgorithm class.

You can manually create a RelativeStrengthIndex 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 Updateupdate method. The indicator will only be ready after you prime it with enough data.

public class RelativeStrengthIndexAlgorithm : QCAlgorithm
{
    private Symbol _symbol;
    private RelativeStrengthIndex _relativestrengthindex;

    public override void Initialize()
    {
        _symbol = AddEquity("SPY", Resolution.Daily).Symbol;
        _relativestrengthindex = new RelativeStrengthIndex(14);
    }

    public override void OnData(Slice data)
    {
        if (data.Bars.TryGetValue(_symbol, out var bar))
            _relativestrengthindex.Update(bar.EndTime, bar.Close);

        if (_relativestrengthindex.IsReady)
        {
            // The current value of _relativestrengthindex is represented by itself (_relativestrengthindex)
            // or _relativestrengthindex.Current.Value
            Plot("RelativeStrengthIndex", "relativestrengthindex", _relativestrengthindex);
            // Plot all properties of abands
            Plot("RelativeStrengthIndex", "averageloss", _relativestrengthindex.AverageLoss);
            Plot("RelativeStrengthIndex", "averagegain", _relativestrengthindex.AverageGain);
        }
    }
}
class RelativeStrengthIndexAlgorithm(QCAlgorithm):
    def initialize(self) -> None:
        self._symbol = self.add_equity("SPY", Resolution.DAILY).symbol
        self._relativestrengthindex = RelativeStrengthIndex(14)

    def on_data(self, slice: Slice) -> None:
        bar = slice.bars.get(self._symbol)
        if bar:
            self._relativestrengthindex.update(bar.end_time, bar.close)

        if self._relativestrengthindex.is_ready:
            # The current value of self._relativestrengthindex is represented by self._relativestrengthindex.current.value
            self.plot("RelativeStrengthIndex", "relativestrengthindex", self._relativestrengthindex.current.value)
            # Plot all attributes of self._relativestrengthindex
            self.plot("RelativeStrengthIndex", "average_loss", self._relativestrengthindex.average_loss.current.value)
            self.plot("RelativeStrengthIndex", "average_gain", self._relativestrengthindex.average_gain.current.value)

For more information about this indicator, see its referencereference.

Visualization

The following plot shows values for some of the RelativeStrengthIndex indicator properties:

RelativeStrengthIndex line plot.

Indicator History

To get the historical data of the RelativeStrengthIndex indicator, call the IndicatorHistoryself.indicator_history method. This method resets your indicator, makes a history request, and updates the indicator with the historical data. Just like with regular history requests, the IndicatorHistoryindicator_history method supports time periods based on a trailing number of bars, a trailing period of time, or a defined period of time. If you don't provide a resolution argument, it defaults to match the resolution of the security subscription. 

public class RelativeStrengthIndexAlgorithm : QCAlgorithm
{
    private Symbol _symbol;
    private RelativeStrengthIndex _rsi;

    public override void Initialize()
    {
        _symbol = AddEquity("SPY", Resolution.Daily).Symbol;
        _rsi = RSI(_symbol, 14);

        var indicatorHistory = IndicatorHistory(_rsi, _symbol, 100, Resolution.Minute);
        var timeSpanIndicatorHistory = IndicatorHistory(_rsi, _symbol, TimeSpan.FromDays(10), Resolution.Minute);
        var timePeriodIndicatorHistory = IndicatorHistory(_rsi, _symbol, new DateTime(2024, 7, 1), new DateTime(2024, 7, 5), Resolution.Minute);

        // Access all attributes of indicatorHistory
        var averageLoss = indicatorHistory.Select(x => ((dynamic)x).AverageLoss).ToList();
        var averageGain = indicatorHistory.Select(x => ((dynamic)x).AverageGain).ToList();
    }
}
class RelativeStrengthIndexAlgorithm(QCAlgorithm):
    def initialize(self) -> None:
        self._symbol = self.add_equity("SPY", Resolution.DAILY).symbol
        self._rsi = self.rsi(self._symbol, 14)

        indicator_history = self.indicator_history(self._rsi, self._symbol, 100, Resolution.MINUTE)
        timedelta_indicator_history = self.indicator_history(self._rsi, self._symbol, timedelta(days=10), Resolution.MINUTE)
        time_period_indicator_history = self.indicator_history(self._rsi, self._symbol, datetime(2024, 7, 1), datetime(2024, 7, 5), Resolution.MINUTE)
    
        # Access all attributes of indicator_history
        indicator_history_df = indicator_history.data_frame
        average_loss = indicator_history_df["averageloss"]
        average_gain = indicator_history_df["averagegain"]

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