TradingAgents/tradingagents/backtest

TradingAgents Backtesting Framework

A comprehensive, production-ready backtesting framework for testing trading strategies with realistic execution simulation and rigorous performance analysis.

Features

• Event-Driven Simulation: Process historical data bar-by-bar with proper time handling
• Realistic Execution: Model slippage, commissions, market impact, and partial fills
• Look-Ahead Bias Prevention: Strict data access controls ensure historical accuracy
• Comprehensive Metrics: 30+ performance metrics including Sharpe, Sortino, Calmar ratios
• Monte Carlo Simulation: Assess risk and confidence intervals for strategy performance
• Walk-Forward Analysis: Detect overfitting through in-sample/out-of-sample testing
• Rich Reporting: Generate HTML reports with interactive charts
• TradingAgents Integration: Seamlessly backtest multi-agent LLM strategies
• Strategy Comparison: Compare multiple strategies side-by-side
• Parallel Processing: Run multiple backtests concurrently

Quick Start

from tradingagents.backtest import Backtester, BacktestConfig, BuyAndHoldStrategy
from decimal import Decimal

# Configure backtest
config = BacktestConfig(
    initial_capital=Decimal('100000.00'),
    start_date='2020-01-01',
    end_date='2023-12-31',
    commission=Decimal('0.001'),
    slippage=Decimal('0.0005'),
    benchmark='SPY',
)

# Create strategy
strategy = BuyAndHoldStrategy()

# Run backtest
backtester = Backtester(config)
results = backtester.run(strategy, tickers=['AAPL', 'MSFT'])

# Analyze results
print(f"Total Return: {results.total_return:.2%}")
print(f"Sharpe Ratio: {results.sharpe_ratio:.2f}")
print(f"Max Drawdown: {results.max_drawdown:.2%}")

# Generate report
results.generate_report('backtest_report.html')

Backtesting TradingAgents

from tradingagents.graph.trading_graph import TradingAgentsGraph
from tradingagents.backtest import backtest_trading_agents

# Create strategy
graph = TradingAgentsGraph(selected_analysts=["market", "fundamentals"])

# Run backtest
results = backtest_trading_agents(
    trading_graph=graph,
    tickers=['AAPL', 'MSFT'],
    start_date='2023-01-01',
    end_date='2023-12-31',
    initial_capital=100000.0,
)

# View results
print(f"Total Return: {results.total_return:.2%}")
results.generate_report('tradingagents_backtest.html')

Custom Strategy

Create your own strategy by extending BaseStrategy:

from tradingagents.backtest import BaseStrategy, Signal
from typing import Dict, List
from datetime import datetime
from decimal import Decimal
import pandas as pd

class MyStrategy(BaseStrategy):
    def __init__(self, param1=10):
        super().__init__(name="MyStrategy")
        self.param1 = param1

    def generate_signals(
        self,
        timestamp: datetime,
        data: Dict[str, pd.DataFrame],
        positions: Dict[str, Position],
        portfolio_value: Decimal,
    ) -> List[Signal]:
        signals = []

        for ticker, df in data.items():
            # Your strategy logic here
            if some_buy_condition:
                signals.append(Signal(
                    ticker=ticker,
                    timestamp=timestamp,
                    action='buy',
                    confidence=0.8,
                ))

        return signals

Configuration

The BacktestConfig class provides extensive configuration options:

config = BacktestConfig(
    # Core parameters
    initial_capital=Decimal('100000.00'),
    start_date='2020-01-01',
    end_date='2023-12-31',

    # Costs
    commission=Decimal('0.001'),        # 0.1%
    slippage=Decimal('0.0005'),         # 0.05%
    commission_model='percentage',       # 'percentage', 'per_share', 'fixed_per_trade'
    slippage_model='fixed',             # 'fixed', 'volume_based', 'spread_based'

    # Risk controls
    max_position_size=Decimal('0.2'),   # Max 20% per position
    max_leverage=Decimal('1.0'),        # No leverage
    allow_short=False,

    # Benchmark
    benchmark='SPY',

    # Performance metrics
    risk_free_rate=Decimal('0.02'),     # 2% annual

    # Data
    data_source='yfinance',
    cache_data=True,
    cache_dir='./data_cache',

    # System
    progress_bar=True,
    log_level='INFO',
    random_seed=42,
)

Performance Metrics

The framework computes comprehensive metrics:

Return Metrics:

• Total Return
• Annualized Return
• Cumulative Return
• Monthly/Daily Returns

Risk-Adjusted Metrics:

• Sharpe Ratio
• Sortino Ratio
• Calmar Ratio
• Omega Ratio

Risk Metrics:

• Volatility (annualized)
• Downside Deviation
• Maximum Drawdown
• Average Drawdown
• Drawdown Duration

Trade Statistics:

• Total Trades
• Win Rate
• Profit Factor
• Average Win/Loss
• Best/Worst Trade

Benchmark Comparison:

• Alpha
• Beta
• Correlation
• Tracking Error
• Information Ratio

Monte Carlo Simulation

Assess strategy robustness with Monte Carlo simulation:

from tradingagents.backtest import MonteCarloConfig

mc_config = MonteCarloConfig(
    n_simulations=10000,
    method='resample_returns',  # or 'resample_trades', 'parametric'
    confidence_levels=[0.90, 0.95, 0.99],
)

mc_results = results.monte_carlo(mc_config)

print(f"Mean Final Value: ${mc_results.mean_final_value:,.2f}")
print(f"95% CI: ${mc_results.confidence_intervals[0.95][0]:,.2f} - "
      f"${mc_results.confidence_intervals[0.95][1]:,.2f}")
print(f"Probability of Profit: {mc_results.probability_of_profit:.2%}")

Walk-Forward Analysis

Detect overfitting with walk-forward optimization:

from tradingagents.backtest import WalkForwardConfig

# Define strategy factory
def strategy_factory(short_window, long_window):
    return SimpleMovingAverageStrategy(short_window, long_window)

# Define parameter grid
param_grid = {
    'short_window': [20, 50, 100],
    'long_window': [100, 200, 300],
}

# Configure walk-forward
wf_config = WalkForwardConfig(
    in_sample_months=12,
    out_sample_months=3,
    optimization_metric='sharpe',
)

# Run analysis
wf_results = backtester.walk_forward_analysis(
    strategy_factory=strategy_factory,
    param_grid=param_grid,
    tickers=['AAPL'],
    wf_config=wf_config,
)

print(f"WF Efficiency Ratio: {wf_results.efficiency_ratio:.2f}")
print(f"Overfitting Score: {wf_results.overfitting_score:.2f}")

Strategy Comparison

Compare multiple strategies:

from tradingagents.backtest import compare_strategies

strategies = {
    'Buy & Hold': BuyAndHoldStrategy(),
    'SMA (50/200)': SimpleMovingAverageStrategy(50, 200),
    'SMA (20/50)': SimpleMovingAverageStrategy(20, 50),
}

comparison = compare_strategies(
    strategies=strategies,
    tickers=['AAPL'],
    start_date='2020-01-01',
    end_date='2023-12-31',
)

print(comparison)

Report Generation

Generate comprehensive HTML reports with interactive charts:

# Generate HTML report
results.generate_report('backtest_report.html')

# Export to CSV
results.export_to_csv('./backtest_results')

Reports include:

• Equity curve
• Drawdown chart
• Monthly returns heatmap
• Returns distribution
• Trade analysis
• Rolling metrics
• Detailed statistics

Best Practices

1. Prevent Look-Ahead Bias

The framework automatically prevents look-ahead bias, but ensure your strategy:

• Only uses data available at the current bar
• Doesn't peek into future data
• Uses point-in-time data access

2. Model Realistic Execution

Configure appropriate:

• Commission rates (typical: 0.1% for retail, 0.01% for institutional)
• Slippage (typical: 0.05% for liquid stocks, higher for illiquid)
• Trading hours enforcement
• Market impact for large orders

3. Test Robustness

• Run Monte Carlo simulations
• Perform walk-forward analysis
• Test on multiple time periods
• Test on different universes of stocks

4. Avoid Overfitting

• Use walk-forward optimization
• Keep strategies simple
• Don't over-optimize on in-sample data
• Check WF efficiency ratio (>0.5 is good)

5. Account for Survivor Bias

When testing on current index constituents:

data_handler.check_survivor_bias(tickers)

This warns about potential survivor bias.

Data Sources

Supported data sources:

• yfinance: Yahoo Finance (free, default)
• CSV: Local CSV files
• alpha_vantage: Alpha Vantage API
• Custom: Implement your own data loader

Configure data source:

config = BacktestConfig(
    data_source='yfinance',  # or 'csv', 'alpha_vantage'
    cache_data=True,         # Cache for faster reruns
    cache_dir='./cache',
)

Position Sizing

Built-in position sizing methods:

from tradingagents.backtest import PositionSizer

# Equal weight
sizer = PositionSizer(method='equal_weight', params={'num_positions': 10})

# Fixed amount
sizer = PositionSizer(method='fixed_amount', params={'amount': Decimal('10000')})

# Confidence weighted
sizer = PositionSizer(method='confidence_weighted')

Risk Management

Built-in risk controls:

from tradingagents.backtest import RiskManager

risk_manager = RiskManager(
    max_position_size=Decimal('0.2'),  # Max 20% per position
    max_leverage=Decimal('2.0'),        # Max 2x leverage
    stop_loss_pct=Decimal('0.05'),      # 5% stop loss
)

Examples

See the examples/ directory for complete examples:

• backtest_example.py: Comprehensive examples with built-in strategies
• backtest_tradingagents.py: TradingAgents-specific examples

Run examples:

python examples/backtest_example.py
python examples/backtest_tradingagents.py

Testing

Run the test suite:

pytest tests/backtest/ -v

Performance Tips

1. Enable Caching: Cache historical data for faster reruns
2. Reduce Progress Bar Overhead: Set progress_bar=False for batch jobs
3. Parallel Backtests: Use parallel_backtest() for multiple strategies
4. Limit Data: Use focused date ranges and ticker lists

Troubleshooting

"DataNotFoundError: No data returned"

• Check internet connection
• Verify ticker symbols are correct
• Ensure date range is valid (not too far in past)
• Try different data source

"InsufficientCapitalError"

• Increase initial_capital
• Reduce position sizes
• Check commission and slippage settings

"LookAheadBiasError"

• Ensure strategy only uses historical data
• Check data_handler.set_current_time() calls
• Verify data access patterns

Limitations

1. Data Quality: Relies on data source quality
2. Execution Modeling: Simplified execution model (no order book)
3. Corporate Actions: Limited handling of splits/dividends
4. Short Selling: Basic short selling support
5. Options/Futures: Not supported (equities only)

Future Enhancements

Planned features:

• Options backtesting
• Futures support
• More sophisticated execution models
• Real-time paper trading
• Strategy optimization algorithms
• Machine learning integration

Contributing

To contribute to the backtesting framework:

1. Follow existing code style
2. Add comprehensive tests
3. Update documentation
4. Ensure no look-ahead bias

License

See main repository LICENSE file.

Support

For issues or questions:

1. Check documentation
2. Review examples
3. Open GitHub issue
4. Check test cases for usage patterns

---

Note: Past performance does not guarantee future results. Backtesting has inherent limitations and should be combined with forward testing and risk management.