goldenChat base source add
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/*
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* SPDX-License-Identifier: MIT
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*/
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package ta4jexamples.backtesting;
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import java.awt.GraphicsEnvironment;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import org.jfree.chart.JFreeChart;
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import org.ta4j.core.AnalysisCriterion;
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import org.ta4j.core.BarSeries;
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import org.ta4j.core.BaseStrategy;
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import org.ta4j.core.Rule;
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import org.ta4j.core.Strategy;
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import org.ta4j.core.TradingRecord;
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import org.ta4j.core.backtest.BarSeriesManager;
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import org.ta4j.core.criteria.LinearTransactionCostCriterion;
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import org.ta4j.core.num.Num;
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import org.ta4j.core.criteria.ValueAtRiskCriterion;
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import org.ta4j.core.criteria.pnl.GrossProfitLossCriterion;
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import org.ta4j.core.criteria.pnl.GrossReturnCriterion;
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import org.ta4j.core.criteria.pnl.NetProfitLossCriterion;
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import org.ta4j.core.criteria.pnl.NetReturnCriterion;
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import org.ta4j.core.criteria.pnl.NetAverageProfitCriterion;
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import org.ta4j.core.criteria.pnl.NetAverageLossCriterion;
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import org.ta4j.core.criteria.pnl.MaxConsecutiveLossCriterion;
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import org.ta4j.core.criteria.pnl.MaxConsecutiveProfitCriterion;
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import org.ta4j.core.indicators.MACDIndicator;
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import org.ta4j.core.indicators.averages.EMAIndicator;
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import org.ta4j.core.indicators.helpers.ClosePriceIndicator;
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import org.ta4j.core.indicators.keltner.KeltnerChannelFacade;
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import org.ta4j.core.indicators.volume.MoneyFlowIndexIndicator;
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import org.ta4j.core.indicators.volume.VWAPIndicator;
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import org.ta4j.core.rules.CrossedDownIndicatorRule;
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import org.ta4j.core.rules.CrossedUpIndicatorRule;
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import org.ta4j.core.rules.OverIndicatorRule;
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import org.ta4j.core.rules.StopGainRule;
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import org.ta4j.core.rules.TrailingStopLossRule;
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import org.ta4j.core.rules.UnderIndicatorRule;
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import ta4jexamples.charting.workflow.ChartWorkflow;
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import ta4jexamples.datasources.CoinbaseHttpBarSeriesDataSource;
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/**
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* Coinbase Data Source Backtest - Advanced Risk Management & Transaction Costs
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* <p>
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* This example demonstrates advanced ta4j features focused on real-world
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* trading considerations:
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* <ul>
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* <li>Loading historical OHLCV data from Coinbase Advanced Trade API</li>
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* <li>MACD (Moving Average Convergence Divergence) with signal line and
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* histogram</li>
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* <li>Keltner Channels (alternative to Bollinger Bands using ATR)</li>
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* <li>VWAP (Volume-Weighted Average Price) - critical for crypto trading</li>
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* <li>Money Flow Index (MFI) - volume-weighted RSI</li>
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* <li>Trailing Stop Loss - dynamic stop that follows price upward</li>
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* <li>Stop Gain - take profit targets</li>
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* <li>Transaction cost analysis - real-world impact of fees</li>
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* <li>Value at Risk (VaR) - risk quantification</li>
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* <li>Gross vs Net metrics - understanding the difference</li>
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* <li>Multiple strategy comparison</li>
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* </ul>
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* <p>
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* <strong>Strategy Concept:</strong> A trend-following strategy using MACD
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* crossovers with Keltner Channel confirmation, VWAP for entry timing, and
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* sophisticated risk management with trailing stops and take-profit targets.
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* <p>
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* <strong>Data Source:</strong> This example uses Coinbase's public market data
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* API to fetch real cryptocurrency data. No API key is required, but be aware
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* of rate limits (350 candles per request, automatically paginated).
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* <p>
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* <strong>Key Learning:</strong> This example emphasizes the critical
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* importance of transaction costs in real trading. Notice how gross returns
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* differ significantly from net returns after accounting for fees!
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*/
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public class CoinbaseBacktest {
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private static final Logger LOG = LogManager.getLogger(CoinbaseBacktest.class);
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public static void main(String[] args) {
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System.out.println("╔══════════════════════════════════════════════════════════════╗");
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System.out.println("║ Coinbase Data Source - Advanced Risk Management ║");
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System.out.println("╚══════════════════════════════════════════════════════════════╝");
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System.out.println();
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// Step 1: Load historical price data from Coinbase
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System.out.println("[1/8] Loading historical price data from Coinbase...");
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System.out.println(" Fetching 1 year of daily data for Bitcoin (BTC-USD)...");
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System.out.println(" (Crypto markets are 24/7 - perfect for trend strategies)");
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// Load 1 year of daily data
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CoinbaseHttpBarSeriesDataSource dataSource = new CoinbaseHttpBarSeriesDataSource(true);
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BarSeries series = dataSource.loadSeriesInstance("BTC-USD",
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CoinbaseHttpBarSeriesDataSource.CoinbaseInterval.ONE_DAY, 365);
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// Alternative methods you can try:
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// BarSeries series = dataSource.loadSeriesInstance("ETH-USD",
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// CoinbaseInterval.ONE_DAY, 500); // 500 bars
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// BarSeries series = dataSource.loadSeriesInstance("BTC-USD",
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// CoinbaseInterval.FOUR_HOUR, 1000); // 4-hour data
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// BarSeries series = dataSource.loadSeriesInstance("ETH-USD",
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// CoinbaseInterval.ONE_DAY,
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// Instant.parse("2023-01-01T00:00:00Z"),
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// Instant.parse("2023-12-31T23:59:59Z")); // Date range
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if (series == null || series.getBarCount() == 0) {
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System.err.println(" [ERROR] Failed to load data from Coinbase");
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System.err.println(" [TIP] Check your internet connection and try again");
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System.err.println(" [TIP] Coinbase API may have rate limits - wait a few minutes and retry");
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return;
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}
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System.out.printf(" [OK] Loaded %d bars of price data%n", series.getBarCount());
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System.out.printf(" [INFO] Date range: %s to %s%n", series.getFirstBar().getEndTime(),
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series.getLastBar().getEndTime());
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System.out.println();
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// Step 2: Create advanced indicators
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System.out.println("[2/8] Creating advanced technical indicators...");
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ClosePriceIndicator closePrice = new ClosePriceIndicator(series);
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// MACD: Trend-following momentum indicator
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// MACD = 12-period EMA - 26-period EMA
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// Signal = 9-period EMA of MACD
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// Histogram = MACD - Signal
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MACDIndicator macd = new MACDIndicator(closePrice, 12, 26);
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EMAIndicator macdSignal = macd.getSignalLine(9);
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// Histogram: difference between MACD and signal line
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// Positive histogram = bullish momentum, negative = bearish
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org.ta4j.core.indicators.numeric.NumericIndicator macdHistogram = macd.getHistogram(9);
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// Keltner Channels: Volatility-based channels using ATR
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// Similar to Bollinger Bands but uses ATR instead of standard deviation
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// More responsive to volatility changes
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KeltnerChannelFacade keltner = new KeltnerChannelFacade(series, 20, 10, 2.0);
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// keltner.middle() = 20-period EMA
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// keltner.upper() = middle + (2.0 * ATR)
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// keltner.lower() = middle - (2.0 * ATR)
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// VWAP: Volume-Weighted Average Price
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// Critical for crypto trading - shows institutional price levels
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// Often acts as support/resistance
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// Using all available bars for VWAP calculation
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VWAPIndicator vwap = new VWAPIndicator(series, series.getBarCount());
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// Money Flow Index: Volume-weighted RSI (0-100)
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// > 80 = overbought, < 20 = oversold
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// More reliable than RSI because it includes volume
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MoneyFlowIndexIndicator mfi = new MoneyFlowIndexIndicator(series, 14);
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System.out.println(" [OK] Created MACD (12, 26, 9) with signal line and histogram");
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System.out.println(" [OK] Created Keltner Channels (20 EMA, 10 ATR, 2.0 multiplier)");
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System.out.println(" [OK] Created VWAP (Volume-Weighted Average Price)");
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System.out.println(" [OK] Created Money Flow Index (14-period)");
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System.out.println();
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// Step 3: Build trend-following strategy with risk management
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System.out.println("[3/8] Building trend-following strategy with advanced risk management...");
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System.out.println(" Strategy: MACD crossover with Keltner Channel confirmation");
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// Entry rule: Buy when MACD crosses above signal line (bullish crossover)
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// AND price is above VWAP (institutional support)
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// AND price is above Keltner middle (uptrend)
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// AND MFI is not overbought (< 80)
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Rule macdBullishCrossover = new CrossedUpIndicatorRule(macd, macdSignal);
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Rule priceAboveVWAP = new OverIndicatorRule(closePrice, vwap);
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Rule priceAboveKeltnerMiddle = new OverIndicatorRule(closePrice, keltner.middle());
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Rule mfiNotOverbought = new UnderIndicatorRule(mfi, series.numFactory().numOf(80));
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Rule buyingRule = macdBullishCrossover.and(priceAboveVWAP).and(priceAboveKeltnerMiddle).and(mfiNotOverbought);
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// Exit rule: Sell when MACD crosses below signal line (bearish crossover)
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// OR trailing stop loss triggers (protects profits)
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// OR stop gain triggers (take profit at 15%)
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// OR price falls below Keltner lower band (breakdown)
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Rule macdBearishCrossover = new CrossedDownIndicatorRule(macd, macdSignal);
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// Trailing stop: 5% trailing stop loss (follows price upward)
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// This protects profits by moving the stop loss up as price rises
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TrailingStopLossRule trailingStop = new TrailingStopLossRule(closePrice, series.numFactory().numOf(5.0));
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// Stop gain: Take profit at 15% gain
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StopGainRule stopGain = new StopGainRule(closePrice, series.numFactory().numOf(15.0));
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Rule priceBelowKeltnerLower = new UnderIndicatorRule(closePrice, keltner.lower());
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Rule sellingRule = macdBearishCrossover.or(trailingStop).or(stopGain).or(priceBelowKeltnerLower);
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Strategy strategy = new BaseStrategy("MACD Trend Following (Risk Managed)", buyingRule, sellingRule);
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System.out.println(" [OK] Entry: MACD bullish crossover + Price > VWAP + Price > Keltner middle + MFI < 80");
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System.out.println(
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" [OK] Exit: MACD bearish crossover OR 5% trailing stop OR 15% stop gain OR Price < Keltner lower");
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System.out.println();
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// Step 4: Run backtest
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System.out.println("[4/8] Running backtest on historical data...");
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BarSeriesManager seriesManager = new BarSeriesManager(series);
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TradingRecord tradingRecord = seriesManager.run(strategy);
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System.out.printf(" [OK] Backtest complete: %d positions executed%n", tradingRecord.getPositionCount());
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System.out.println();
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// Step 5: Performance analysis with transaction costs
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System.out.println("[5/8] Performance Analysis (WITH Transaction Costs)");
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System.out.println(" ──────────────────────────────────────────");
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// Transaction cost parameters (typical for crypto exchanges)
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// Coinbase Advanced Trade: 0.4% maker fee, 0.6% taker fee
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// Using 0.5% average (0.005) per trade (entry + exit = 1% total per round trip)
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double initialAmount = 10000.0; // $10,000 starting capital
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double feePercentage = 0.005; // 0.5% per trade
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// Gross metrics (before transaction costs)
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AnalysisCriterion grossReturn = new GrossReturnCriterion();
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AnalysisCriterion grossProfitLoss = new GrossProfitLossCriterion();
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Num grossReturnValue = grossReturn.calculate(series, tradingRecord);
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Num grossProfitLossValue = grossProfitLoss.calculate(series, tradingRecord);
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// Net metrics (after transaction costs)
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AnalysisCriterion netReturn = new NetReturnCriterion();
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AnalysisCriterion netProfitLoss = new NetProfitLossCriterion();
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Num netReturnValue = netReturn.calculate(series, tradingRecord);
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Num netProfitLossValue = netProfitLoss.calculate(series, tradingRecord);
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// Transaction costs
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LinearTransactionCostCriterion transactionCosts = new LinearTransactionCostCriterion(initialAmount,
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feePercentage);
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Num totalCosts = transactionCosts.calculate(series, tradingRecord);
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// Average profit/loss per trade
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AnalysisCriterion avgProfit = new NetAverageProfitCriterion();
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AnalysisCriterion avgLoss = new NetAverageLossCriterion();
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Num avgProfitValue = avgProfit.calculate(series, tradingRecord);
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Num avgLossValue = avgLoss.calculate(series, tradingRecord);
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// Consecutive streaks
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AnalysisCriterion maxConsecutiveProfit = new MaxConsecutiveProfitCriterion();
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AnalysisCriterion maxConsecutiveLoss = new MaxConsecutiveLossCriterion();
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Num maxConsecutiveProfitValue = maxConsecutiveProfit.calculate(series, tradingRecord);
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Num maxConsecutiveLossValue = maxConsecutiveLoss.calculate(series, tradingRecord);
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// Risk metrics
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ValueAtRiskCriterion var95 = new ValueAtRiskCriterion(0.95); // 95% confidence level
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Num var95Value = var95.calculate(series, tradingRecord);
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// Display comprehensive results
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System.out.println(" Gross Performance (Before Fees):");
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System.out.printf(" Gross Return: %.2f%%%n",
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grossReturnValue.multipliedBy(series.numFactory().numOf(100)).doubleValue());
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System.out.printf(" Gross Profit/Loss: $%.2f%n", grossProfitLossValue.doubleValue());
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System.out.println();
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System.out.println(" Transaction Costs:");
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System.out.printf(" Total Fees Paid: $%.2f (%.2f%% of initial capital)%n", totalCosts.doubleValue(),
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totalCosts.dividedBy(series.numFactory().numOf(initialAmount))
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.multipliedBy(series.numFactory().numOf(100))
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.doubleValue());
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System.out.printf(" Fee per Trade: %.2f%% (entry + exit)%n", feePercentage * 200);
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System.out.println();
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System.out.println(" Net Performance (After Fees):");
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System.out.printf(" Net Return: %.2f%%%n",
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netReturnValue.multipliedBy(series.numFactory().numOf(100)).doubleValue());
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System.out.printf(" Net Profit/Loss: $%.2f%n", netProfitLossValue.doubleValue());
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System.out.printf(" Impact of Fees: %.2f%% (difference between gross and net)%n",
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grossReturnValue.minus(netReturnValue).multipliedBy(series.numFactory().numOf(100)).doubleValue());
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System.out.println();
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System.out.println(" Trade Statistics:");
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System.out.printf(" Average Profit: $%.2f%n", avgProfitValue.doubleValue());
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System.out.printf(" Average Loss: $%.2f%n", avgLossValue.doubleValue());
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System.out.printf(" Max Consecutive Wins: %d%n", maxConsecutiveProfitValue.intValue());
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System.out.printf(" Max Consecutive Losses: %d%n", maxConsecutiveLossValue.intValue());
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System.out.println();
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System.out.println(" Risk Metrics:");
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System.out.printf(" Value at Risk (95%%): %.2f%% (worst expected loss)%n",
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var95Value.multipliedBy(series.numFactory().numOf(100)).doubleValue());
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System.out.println();
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// Step 6: Compare strategies (with and without trailing stop)
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System.out.println("[6/8] Strategy Comparison: With vs Without Trailing Stop");
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System.out.println(" ──────────────────────────────────────────");
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// Strategy without trailing stop (only MACD crossover)
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Rule simpleBuyingRule = macdBullishCrossover.and(priceAboveVWAP);
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Rule simpleSellingRule = macdBearishCrossover.or(stopGain).or(priceBelowKeltnerLower);
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Strategy simpleStrategy = new BaseStrategy("MACD Simple (No Trailing Stop)", simpleBuyingRule,
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simpleSellingRule);
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TradingRecord simpleRecord = seriesManager.run(simpleStrategy);
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Num simpleNetReturn = netReturn.calculate(series, simpleRecord);
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Num strategyNetReturn = netReturn.calculate(series, tradingRecord);
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System.out.printf(" Simple Strategy (no trailing stop): %.2f%% net return%n",
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simpleNetReturn.multipliedBy(series.numFactory().numOf(100)).doubleValue());
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System.out.printf(" Risk-Managed Strategy (with trailing stop): %.2f%% net return%n",
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strategyNetReturn.multipliedBy(series.numFactory().numOf(100)).doubleValue());
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System.out.printf(" Difference: %.2f%%%n",
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strategyNetReturn.minus(simpleNetReturn).multipliedBy(series.numFactory().numOf(100)).doubleValue());
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System.out.println();
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// Step 7: Visualize the strategy
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System.out.println("[7/8] Generating comprehensive strategy visualization...");
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boolean isHeadless = GraphicsEnvironment.isHeadless();
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if (isHeadless) {
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System.out.println(" [WARN] Headless environment detected - skipping chart display");
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System.out.println(" [TIP] Run in a GUI environment to see interactive charts!");
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} else {
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try {
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ChartWorkflow chartWorkflow = new ChartWorkflow();
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JFreeChart chart = chartWorkflow.builder()
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.withTitle("MACD Trend Following Strategy - Coinbase Data (BTC-USD)")
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.withSeries(series) // Price bars (candlesticks)
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.withTradingRecordOverlay(tradingRecord) // Trading positions marked on price chart
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.withIndicatorOverlay(keltner.middle()) // Keltner middle band
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.withIndicatorOverlay(keltner.upper()) // Keltner upper band
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.withIndicatorOverlay(keltner.lower()) // Keltner lower band
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.withIndicatorOverlay(vwap) // VWAP overlay
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.withSubChart(macd) // MACD in first subchart
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.withIndicatorOverlay(macdSignal) // MACD signal line
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.withSubChart(macdHistogram) // MACD histogram in second subchart
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.withSubChart(mfi) // Money Flow Index in third subchart
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.withSubChart(new NetProfitLossCriterion(), tradingRecord) // Net P&L in fourth subchart
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.toChart();
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chartWorkflow.displayChart(chart, "ta4j Coinbase Backtest - MACD Trend Following with Risk Management");
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System.out.println(" [OK] Multi-subchart displayed in new window");
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System.out.println(" [TIP] Chart shows: Price with Keltner Channels & VWAP, MACD, MFI, and P&L");
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} catch (Exception ex) {
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LOG.warn("Failed to display chart: {}", ex.getMessage(), ex);
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System.out.println(" [WARN] Could not display chart: " + ex.getMessage());
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}
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}
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System.out.println();
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// Step 8: Explain advanced concepts
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System.out.println("[8/8] Advanced Concepts Demonstrated");
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System.out.println(" ──────────────────────────────────────────");
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System.out.println(" ✓ MACD: Trend-following momentum indicator");
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System.out.println(" - Bullish crossover: MACD crosses above signal line");
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System.out.println(" - Histogram shows momentum strength");
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System.out.println();
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System.out.println(" ✓ Keltner Channels: Volatility-based price channels");
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System.out.println(" - Uses ATR instead of standard deviation (more responsive)");
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System.out.println(" - Upper/lower bands adapt to market volatility");
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System.out.println();
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System.out.println(" ✓ VWAP: Volume-Weighted Average Price");
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System.out.println(" - Critical for crypto trading (institutional levels)");
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System.out.println(" - Price above VWAP = bullish, below = bearish");
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System.out.println();
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||||
System.out.println(" ✓ Trailing Stop Loss: Dynamic risk management");
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System.out.println(" - Follows price upward, protecting profits");
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System.out.println(" - More effective than fixed stop loss in trending markets");
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System.out.println();
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System.out.println(" ✓ Stop Gain: Take-profit targets");
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System.out.println(" - Locks in profits at predetermined levels");
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System.out.println(" - Prevents giving back gains in volatile markets");
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||||
System.out.println();
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System.out.println(" ✓ Transaction Costs: Real-world impact");
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System.out.println(" - Gross returns vs Net returns (after fees)");
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System.out.println(" - Fees can significantly impact profitability");
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||||
System.out.println(" - Always account for costs in backtesting!");
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||||
System.out.println();
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||||
System.out.println(" ✓ Value at Risk (VaR): Risk quantification");
|
||||
System.out.println(" - Measures worst expected loss at confidence level");
|
||||
System.out.println(" - Helps understand downside risk");
|
||||
System.out.println();
|
||||
System.out.println(" ✓ Gross vs Net Metrics: Understanding the difference");
|
||||
System.out.println(" - Gross: Before transaction costs");
|
||||
System.out.println(" - Net: After transaction costs (real-world)");
|
||||
System.out.println(" - Always use net metrics for real trading decisions");
|
||||
System.out.println();
|
||||
|
||||
// Summary
|
||||
System.out.println("╔══════════════════════════════════════════════════════════════╗");
|
||||
System.out.println("║ Summary ║");
|
||||
System.out.println("╚══════════════════════════════════════════════════════════════╝");
|
||||
System.out.println();
|
||||
System.out.println("What just happened?");
|
||||
System.out.println();
|
||||
System.out.println(" 1. Loaded 1 year of daily OHLCV data for BTC-USD from Coinbase");
|
||||
System.out.println(" 2. Created advanced indicators:");
|
||||
System.out.println(" - MACD with signal line and histogram (trend momentum)");
|
||||
System.out.println(" - Keltner Channels (volatility-based channels)");
|
||||
System.out.println(" - VWAP (institutional price levels)");
|
||||
System.out.println(" - Money Flow Index (volume-weighted momentum)");
|
||||
System.out.println(" 3. Built a trend-following strategy with risk management:");
|
||||
System.out.println(" - Entry: MACD bullish crossover + Price > VWAP + Price > Keltner middle + MFI < 80");
|
||||
System.out.println(
|
||||
" - Exit: MACD bearish crossover OR 5% trailing stop OR 15% stop gain OR Price < Keltner lower");
|
||||
System.out.println(" 4. Backtested with transaction costs (0.5% per trade)");
|
||||
System.out.println(" 5. Analyzed gross vs net performance (impact of fees)");
|
||||
System.out.println(" 6. Compared strategies (with/without trailing stop)");
|
||||
System.out.println(" 7. Calculated risk metrics (Value at Risk)");
|
||||
if (!isHeadless) {
|
||||
System.out.println(" 8. Visualized with multi-subchart (Price, MACD, MFI, P&L)");
|
||||
}
|
||||
System.out.println();
|
||||
System.out.println("Advanced Features Demonstrated:");
|
||||
System.out.println(" ✓ MACD with signal line and histogram");
|
||||
System.out.println(" ✓ Keltner Channels (ATR-based volatility bands)");
|
||||
System.out.println(" ✓ VWAP for institutional price levels");
|
||||
System.out.println(" ✓ Money Flow Index (volume-weighted RSI)");
|
||||
System.out.println(" ✓ Trailing Stop Loss (dynamic profit protection)");
|
||||
System.out.println(" ✓ Stop Gain (take-profit targets)");
|
||||
System.out.println(" ✓ Transaction cost analysis (real-world impact)");
|
||||
System.out.println(" ✓ Value at Risk (risk quantification)");
|
||||
System.out.println(" ✓ Gross vs Net metrics comparison");
|
||||
System.out.println(" ✓ Multiple strategy comparison");
|
||||
System.out.println();
|
||||
System.out.println("Coinbase Data Source Features:");
|
||||
System.out.println(" - Load data by number of days: loadSeries(\"BTC-USD\", 365)");
|
||||
System.out.println(" - Load data by bar count: loadSeries(\"BTC-USD\", ONE_DAY, 500)");
|
||||
System.out.println(" - Load data by date range: loadSeries(\"BTC-USD\", ONE_DAY, start, end)");
|
||||
System.out.println(" - Supports multiple intervals: 1m, 5m, 15m, 30m, 1h, 2h, 4h, 6h, 1d");
|
||||
System.out.println(" - Works with all Coinbase trading pairs (BTC-USD, ETH-USD, etc.)");
|
||||
System.out.println(" - Automatic pagination for large date ranges (350 candles per request)");
|
||||
System.out.println();
|
||||
System.out.println("Key Takeaways:");
|
||||
System.out.println(" • Transaction costs matter! Always use net returns for decisions.");
|
||||
System.out.println(" • Trailing stops protect profits better than fixed stops.");
|
||||
System.out.println(" • VWAP is critical for crypto trading (institutional levels).");
|
||||
System.out.println(" • Risk metrics (VaR) help quantify downside risk.");
|
||||
System.out.println(" • Gross vs Net metrics show the real impact of fees.");
|
||||
System.out.println();
|
||||
System.out.println("Next Steps - Experiment with:");
|
||||
System.out.println(" - Different cryptocurrencies: \"ETH-USD\", \"SOL-USD\", \"ADA-USD\"");
|
||||
System.out.println(" - Adjust MACD periods (try 8/21 or 19/39)");
|
||||
System.out.println(" - Modify trailing stop percentage (try 3% or 7%)");
|
||||
System.out.println(" - Change stop gain targets (try 10% or 20%)");
|
||||
System.out.println(" - Test different fee structures (0.1%, 0.25%, 1.0%)");
|
||||
System.out.println(" - Try different intervals: FOUR_HOUR, SIX_HOUR for shorter timeframes");
|
||||
System.out.println(" - Explore other examples in ta4j-examples");
|
||||
System.out.println(" - Check out the wiki: https://ta4j.github.io/ta4j-wiki/");
|
||||
System.out.println();
|
||||
System.out.println("Your turn! Modify this code and see how transaction costs affect profitability.");
|
||||
System.out.println();
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user