Deutsch DE
Auf GitHub ansehen

Bollinger Stochastic Strategy

Bollinger Stochastic pairs Bollinger Bands with the stochastic oscillator to identify overextended moves. Price touching the outer band while the oscillator is in an extreme zone suggests a possible snap back.

Testing indicates an average annual return of about 133%. It performs best in the crypto market.

The system fades those extremes, going long when price hits the lower band with stochastic oversold, and shorting the upper band with stochastic overbought.

A percent-based stop limits risk if the mean reversion fails to occur.

Details

  • Entry Criteria: indicator signal
  • Long/Short: Both
  • Exit Criteria: stop-loss or opposite signal
  • Stops: Yes, percent based
  • Default Values:
    • CandleType = 15 minute
    • StopLoss = 2%
  • Filters:
    • Category: Mean reversion
    • Direction: Both
    • Indicators: Bollinger Bands, Stochastic
    • Stops: Yes
    • Complexity: Intermediate
    • Timeframe: Intraday
    • Seasonality: No
    • Neural networks: No
    • Divergence: No
    • Risk level: Medium
using System;
using System.Collections.Generic;

using Ecng.Common;

using StockSharp.Algo.Indicators;
using StockSharp.Algo.Strategies;
using StockSharp.BusinessEntities;
using StockSharp.Messages;

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Strategy combining Bollinger Bands and Stochastic oscillator for mean-reversion.
/// Buys when price touches lower band with oversold stochastic, sells at upper band with overbought.
/// </summary>
public class BollingerStochasticStrategy : Strategy
{
	private readonly StrategyParam<DataType> _candleType;
	private readonly StrategyParam<int> _bollingerPeriod;
	private readonly StrategyParam<decimal> _bollingerDeviation;
	private readonly StrategyParam<decimal> _stochOversold;
	private readonly StrategyParam<decimal> _stochOverbought;
	private readonly StrategyParam<int> _cooldownBars;

	private decimal _stochK;
	private int _cooldown;

	/// <summary>
	/// Data type for candles.
	/// </summary>
	public DataType CandleType
	{
		get => _candleType.Value;
		set => _candleType.Value = value;
	}

	/// <summary>
	/// Period for Bollinger Bands calculation.
	/// </summary>
	public int BollingerPeriod
	{
		get => _bollingerPeriod.Value;
		set => _bollingerPeriod.Value = value;
	}

	/// <summary>
	/// Standard deviation multiplier for Bollinger Bands.
	/// </summary>
	public decimal BollingerDeviation
	{
		get => _bollingerDeviation.Value;
		set => _bollingerDeviation.Value = value;
	}

	/// <summary>
	/// Stochastic oversold level.
	/// </summary>
	public decimal StochOversold
	{
		get => _stochOversold.Value;
		set => _stochOversold.Value = value;
	}

	/// <summary>
	/// Stochastic overbought level.
	/// </summary>
	public decimal StochOverbought
	{
		get => _stochOverbought.Value;
		set => _stochOverbought.Value = value;
	}

	/// <summary>
	/// Cooldown bars between trades.
	/// </summary>
	public int CooldownBars
	{
		get => _cooldownBars.Value;
		set => _cooldownBars.Value = value;
	}

	/// <summary>
	/// Initializes a new instance of the <see cref="BollingerStochasticStrategy"/>.
	/// </summary>
	public BollingerStochasticStrategy()
	{
		_candleType = Param(nameof(CandleType), TimeSpan.FromMinutes(5).TimeFrame())
			.SetDisplay("Candle Type", "Type of candles to use", "General");

		_bollingerPeriod = Param(nameof(BollingerPeriod), 20)
			.SetRange(10, 50)
			.SetDisplay("BB Period", "Period for Bollinger Bands", "Bollinger Settings");

		_bollingerDeviation = Param(nameof(BollingerDeviation), 2.0m)
			.SetDisplay("BB Deviation", "Standard deviation multiplier", "Bollinger Settings");

		_stochOversold = Param(nameof(StochOversold), 20m)
			.SetDisplay("Oversold Level", "Stochastic oversold level", "Stochastic Settings");

		_stochOverbought = Param(nameof(StochOverbought), 80m)
			.SetDisplay("Overbought Level", "Stochastic overbought level", "Stochastic Settings");

		_cooldownBars = Param(nameof(CooldownBars), 50)
			.SetDisplay("Cooldown Bars", "Bars between trades", "General")
			.SetRange(5, 500);
	}

	/// <inheritdoc />
	public override IEnumerable<(Security sec, DataType dt)> GetWorkingSecurities()
	{
		return [(Security, CandleType)];
	}

	/// <inheritdoc />
	protected override void OnReseted()
	{
		base.OnReseted();
		_stochK = 50;
		_cooldown = 0;
	}

	/// <inheritdoc />
	protected override void OnStarted2(DateTime time)
	{
		base.OnStarted2(time);

		var bollinger = new BollingerBands
		{
			Length = BollingerPeriod,
			Width = BollingerDeviation
		};

		var stochastic = new StochasticOscillator();

		var subscription = SubscribeCandles(CandleType);

		// Bind stochastic with BindEx
		subscription.BindEx(stochastic, OnStochastic);

		// Bind bollinger bands with BindEx
		subscription
			.BindEx(bollinger, ProcessCandle)
			.Start();

		var area = CreateChartArea();
		if (area != null)
		{
			DrawCandles(area, subscription);
			DrawIndicator(area, bollinger);
			DrawOwnTrades(area);

			var stochArea = CreateChartArea();
			if (stochArea != null)
				DrawIndicator(stochArea, stochastic);
		}
	}

	private void OnStochastic(ICandleMessage candle, IIndicatorValue stochValue)
	{
		var stoch = (IStochasticOscillatorValue)stochValue;
		if (stoch.K is decimal k)
			_stochK = k;
	}

	private void ProcessCandle(ICandleMessage candle, IIndicatorValue bbValue)
	{
		if (candle.State != CandleStates.Finished)
			return;

		if (!IsFormedAndOnlineAndAllowTrading())
			return;

		var bb = (BollingerBandsValue)bbValue;
		if (bb.UpBand is not decimal upper ||
			bb.LowBand is not decimal lower ||
			bb.MovingAverage is not decimal middle)
			return;

		var close = candle.ClosePrice;

		if (_cooldown > 0)
		{
			_cooldown--;
			return;
		}

		// Buy: price at lower band + stochastic oversold
		if (close <= lower && _stochK < StochOversold && Position == 0)
		{
			BuyMarket();
			_cooldown = CooldownBars;
		}
		// Sell: price at upper band + stochastic overbought
		else if (close >= upper && _stochK > StochOverbought && Position == 0)
		{
			SellMarket();
			_cooldown = CooldownBars;
		}

		// Exit long at middle band
		if (Position > 0 && close > middle)
		{
			SellMarket();
			_cooldown = CooldownBars;
		}
		// Exit short at middle band
		else if (Position < 0 && close < middle)
		{
			BuyMarket();
			_cooldown = CooldownBars;
		}
	}
}