The code correctly translates a trading strategy into math without syntax errors or circular references.
Look-ahead bias occurs when a formula uses future data to generate a signal today. Functions like Ref( Close, 1 ) or poorly constructed Zig() indicators look forward in time. This creates spectacular backtest results that are impossible to replicate in live trading. 2. Incorrect Trade Delays amibroker afl code verified
For traders looking to automate their strategies, finding and using is not just a preference; it is a necessity. A verified formula ensures that the code has been tested for logic errors, backtested for profitability, and optimized for execution speed. The code correctly translates a trading strategy into
// 1. System Settings & Backtester Setup SetOption("InitialCapital", 100000); SetOption("DefaultPositions", 5); SetOption("CommissionMode", 1); // Percentage basis SetOption("CommissionAmount", 0.03); SetTradeDelays(1, 1, 1, 1); // Trade on the next day's open to avoid look-ahead bias // 2. Strategy Parameters (User Adjust-able) FastPeriod = Param("Fast MA Period", 15, 2, 100, 1); SlowPeriod = Param("Slow MA Period", 45, 2, 200, 1); // 3. Core Mathematical Indicators FastMA = MA( Close, FastPeriod ); SlowMA = MA( Close, SlowPeriod ); // 4. Trading Logic (Signals) Buy = Cross( FastMA, SlowMA ); Sell = Cross( SlowMA, FastMA ); // Remove redundant consecutive signals Buy = ExRem( Buy, Sell ); Sell = ExRem( Sell, Buy ); // 5. Price and Indicator Visualizations Plot( Close, "Price Chart", colorCandle, styleCandle ); Plot( FastMA, "Fast MA (" + FastPeriod + ")", colorBlue, styleLine | styleThick ); Plot( SlowMA, "Slow MA (" + SlowPeriod + ")", colorOrange, styleLine | styleThick ); // 6. Signal Visualizations (Visual Verification Anchor) PlotShapes( IIf( Buy, shapeUpArrow, shapeNone ), colorGreen, 0, Low, -15 ); PlotShapes( IIf( Sell, shapeDownArrow, shapeNone ), colorRed, 0, High, -15 ); Use code with caution. Best Practices for Sourcing Verified AFL Code A verified formula ensures that the code has
To completely rule out future leaks, use a simple tracking trick. Duplicate your dataset, shift the historical dates manually, or write an audit function within your AFL that forces entry signals to be delayed by one bar ( Ref(Buy, -1) ). If your backtest returns identically miraculous results after altering the timing, your code is leaking future data. Step 3: Debug via the Indicator Window and Plotting
The code must work across multiple timeframes (e.g., 5-minute, hourly, daily). It should handle different asset classes like stocks, forex, and futures without crashing. 4. Order Execution Safety