Backtesting a single parameter set is insufficient for verification. Use AmiBroker’s feature to:
// --- 1. SETUP & SAFETY (Prevents Future Leaks & Crashes) --- SetBarsRequired(100000, 50000); // Allocates enough memory SetTradeDelays(1, 1, 1, 1); // Trade on NEXT bar's open (CRITICAL) SetOption("InitialEquity", 100000); SetOption("MaxOpenPositions", 5); SetPositionSize(20, spsPercentOfEquity); // 20% risk per position
The code must handle Null values, delisted stocks, and different timeframes gracefully. Verified code uses Nz() (Non-Zero) to prevent NaN errors.
Double-check the "Exclude" tab in the Analysis window's filter dialog when working with watchlists to ensure symbols are included. The order of symbols in the list can also be a factor.
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Follow this systematic process to verify any AFL script before using real money. Step 1: Use the Syntax Checker
function to create sliders, allowing you to stress-test the script’s sensitivity to different input values in real-time. 3. Performance Benchmarking
The official library contains hundreds of user-submitted formulas. While not all are thoroughly tested, many are well-vetted by the community.
This code defines a simple moving average indicator with a user-defined length. The code is straightforward and easy to verify: Backtesting a single parameter set is insufficient for
Professional-grade AFL is well-documented. Each block of code—from moving average crossovers to complex RSI filters—should be labeled. This allows the trader to audit the logic and make adjustments without breaking the script. 3. Optimization Readiness
Understanding what can go wrong is just as important as knowing what "verified" means. Based on years of community experience and official documentation, here are some of the most frequent mistakes that render AFL code unverified and unreliable:
// CORRECT – use IIf or evaluate on a specific bar Color = IIf( Close > Open, 1, 0 );
A common trap: you edit and save your AFL file, but the Analysis window still runs an older version. This happens because the Analysis window caches the formula version used in the last run. Verified code uses Nz() (Non-Zero) to prevent NaN errors
: Use AddColumn() in the Analysis window to output array data into a spreadsheet format for manual verification.
On the official AmiBroker forums, you must have the "License Verified" badge to create new topics or ask questions. You can verify your license through the AmiBroker Members Zone Show Your Work:
The easiest way to verify logic is to visualize the raw arrays. If your logic is Cross(MA(C,10), MA(C,50)) , plot both MAs to see where they actually cross.
Use the "Prettify" feature in the AmiBroker AFL Editor before pasting to ensure consistent indentation.