日本語 JA
GitHub で見る

Autocorrelation Reversal Strategy

This strategy analyzes short-term price autocorrelation to gauge whether recent moves are likely to reverse. Negative autocorrelation suggests successive price changes tend to alternate direction, creating mean-reverting conditions.

Testing indicates an average annual return of about 124%. It performs best in the forex market.

When the calculated autocorrelation falls below the threshold and price is below a moving average, the system buys in anticipation of a bounce. If autocorrelation is negative and price is above the average, a short position is opened. Exits occur once price crosses the average or autocorrelation rises above the threshold.

The approach is suited for traders looking for statistical edges rather than chart patterns. A percentage stop-loss is applied to protect against sustained trends that violate the expected reversal.

Details

  • Entry Criteria:
    • Long: Autocorrelation < Threshold && Close < MA
    • Short: Autocorrelation < Threshold && Close > MA
  • Long/Short: Both sides.
  • Exit Criteria:
    • Long: Exit when Close > MA or autocorrelation > Threshold
    • Short: Exit when Close < MA or autocorrelation > Threshold
  • Stops: Yes, percent stop-loss.
  • Default Values:
    • AutoCorrPeriod = 20
    • AutoCorrThreshold = -0.3m
    • StopLossPercent = 2m
    • CandleType = TimeSpan.FromMinutes(5)
  • Filters:
    • Category: Mean Reversion
    • Direction: Both
    • Indicators: Autocorrelation, MA
    • Stops: Yes
    • Complexity: Intermediate
    • Timeframe: Intraday
    • Seasonality: No
    • Neural networks: No
    • Divergence: No
    • Risk Level: Medium
using System;
using System.Linq;
using System.Collections.Generic;

using Ecng.Common;
using Ecng.Collections;
using Ecng.Serialization;

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

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Strategy that trades based on price autocorrelation.
/// Buys when autocorrelation is negative and price is below average.
/// Sells when autocorrelation is negative and price is above average.
/// </summary>
public class AutocorrelationReversionStrategy : Strategy
{
	private readonly StrategyParam<int> _autoCorrPeriod;
	private readonly StrategyParam<decimal> _autoCorrThreshold;
	private readonly StrategyParam<decimal> _stopLossPercent;
	private readonly StrategyParam<DataType> _candleType;

	private SimpleMovingAverage _sma;
	private decimal _currentPrice;
	private readonly Queue<decimal> _priceHistory = [];
	private decimal _latestAutocorrelation;

	/// <summary>
	/// Period for autocorrelation calculation.
	/// </summary>
	public int AutoCorrPeriod
	{
		get => _autoCorrPeriod.Value;
		set => _autoCorrPeriod.Value = value;
	}

	/// <summary>
	/// Autocorrelation threshold for signal generation.
	/// </summary>
	public decimal AutoCorrThreshold
	{
		get => _autoCorrThreshold.Value;
		set => _autoCorrThreshold.Value = value;
	}

	/// <summary>
	/// Stop-loss percentage.
	/// </summary>
	public decimal StopLossPercent
	{
		get => _stopLossPercent.Value;
		set => _stopLossPercent.Value = value;
	}

	/// <summary>
	/// Type of candles to use.
	/// </summary>
	public DataType CandleType
	{
		get => _candleType.Value;
		set => _candleType.Value = value;
	}

	/// <summary>
	/// Constructor.
	/// </summary>
	public AutocorrelationReversionStrategy()
	{
		_autoCorrPeriod = Param(nameof(AutoCorrPeriod), 20)
			.SetDisplay("Autocorrelation period", "Period for autocorrelation calculation", "Strategy parameters")
			
			.SetOptimize(10, 30, 5);

		_autoCorrThreshold = Param(nameof(AutoCorrThreshold), -0.3m)
			.SetDisplay("Autocorr threshold", "Threshold for autocorrelation signals", "Strategy parameters")
			
			.SetOptimize(-0.5m, -0.1m, 0.1m);

		_stopLossPercent = Param(nameof(StopLossPercent), 2m)
			.SetDisplay("Stop-loss %", "Stop-loss as percentage from entry price", "Risk management")
			
			.SetOptimize(1m, 3m, 0.5m);

		_candleType = Param(nameof(CandleType), TimeSpan.FromMinutes(5).TimeFrame())
			.SetDisplay("Candle type", "Type of candles to use", "General");
	}

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

	/// <inheritdoc />
	protected override void OnReseted()
	{
		base.OnReseted();

		_priceHistory.Clear();
		_latestAutocorrelation = default;
		_currentPrice = default;
	}

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

		// Initialize the SMA indicator (using same period as autocorrelation for simplicity)
		_sma = new SMA { Length = AutoCorrPeriod };

		// Create a subscription to candlesticks
		var subscription = SubscribeCandles(CandleType);

		// Subscribe to candle processing
		subscription
			.Bind(_sma, ProcessCandle)
			.Start();

		// Start position protection
		StartProtection(
			new Unit(StopLossPercent, UnitTypes.Percent),
			new Unit(StopLossPercent * 1.5m, UnitTypes.Percent));

		// Setup chart if available
		var area = CreateChartArea();
		if (area != null)
		{
			DrawCandles(area, subscription);
			DrawIndicator(area, _sma);
			DrawOwnTrades(area);
		}
	}

	private void ProcessCandle(ICandleMessage candle, decimal smaValue)
	{
		// Skip unfinished candles
		if (candle.State != CandleStates.Finished)
			return;

		// Update current price and price history
		_currentPrice = candle.ClosePrice;
		
		// Update price history queue
		_priceHistory.Enqueue(_currentPrice);
		if (_priceHistory.Count > AutoCorrPeriod)
			_priceHistory.Dequeue();

		// Wait until we have enough data
		if (_priceHistory.Count < AutoCorrPeriod)
			return;

		// Check if strategy is ready to trade
		if (!IsFormedAndOnlineAndAllowTrading())
			return;

		// Calculate autocorrelation
		_latestAutocorrelation = CalculateAutocorrelation();

		// Log the autocorrelation value
		LogInfo($"Autocorrelation: {_latestAutocorrelation}, Current price: {_currentPrice}, SMA: {smaValue}");

		// Trading logic: Look for negative autocorrelation below threshold
		if (_latestAutocorrelation < AutoCorrThreshold)
		{
			// Price below average - buy signal
			if (_currentPrice < smaValue && Position <= 0)
			{
				BuyMarket(Volume);
				LogInfo($"Buy signal: Autocorr={_latestAutocorrelation}, Price={_currentPrice}, SMA={smaValue}");
			}
			// Price above average - sell signal
			else if (_currentPrice > smaValue && Position >= 0)
			{
				SellMarket(Volume + Math.Abs(Position));
				LogInfo($"Sell signal: Autocorr={_latestAutocorrelation}, Price={_currentPrice}, SMA={smaValue}");
			}
		}
	}

	private decimal CalculateAutocorrelation()
	{
		// Convert queue to array for easier calculation
		decimal[] prices = [.. _priceHistory];
		
		// Calculate price changes
		decimal[] priceChanges = new decimal[prices.Length - 1];
		for (int i = 0; i < prices.Length - 1; i++)
		{
			priceChanges[i] = prices[i + 1] - prices[i];
		}

		// Calculate autocorrelation of lag 1
		decimal meanChange = priceChanges.Average();
		
		decimal numerator = 0;
		decimal denominator = 0;
		
		for (int i = 0; i < priceChanges.Length - 1; i++)
		{
			decimal deviation1 = priceChanges[i] - meanChange;
			decimal deviation2 = priceChanges[i + 1] - meanChange;
			
			numerator += deviation1 * deviation2;
			denominator += deviation1 * deviation1;
		}
		
		// Guard against division by zero
		if (denominator == 0)
			return 0;
			
		return numerator / denominator;
	}
}