Check if signals disappear or shift when you scroll through time. 3. Eliminating Forward-Looking Bias (Look-Ahead Bias)
Follow this checklist to manually verify any AFL script you download from the internet or write yourself. Step 1: Use the Built-in AFL Editor Check Open your code inside the AmiBroker AFL Editor.
// ------------------- VERIFICATION MODULE -------------------
Search for these patterns:
Do not rely solely on backtest report sheets. Use the PlotShapes() function shown in the template above. Zoom into individual bars on your chart to ensure the buy arrow appears exactly on the bar dictated by your strategy logic. Step 4: Run a Walk-Forward Analysis
Verified AFL code is not optional for serious automated trading. This paper provides a : static analysis, runtime assertions, repaint testing, and execution fidelity checks. By applying these methods, a developer can eliminate the most common sources of backtest overfitting and live-market failure.
If you prefer to configure this through the user interface rather than code: amibroker afl code verified
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Avoid generic names like x or y . Use descriptive names like ShortMA or BuySignal .
Test your formula on data it has never seen before to confirm it works under different market conditions. Conclusion Check if signals disappear or shift when you
Verification isn’t a one‑time step—it is an ongoing discipline that separates robust, professional systems from fragile, mistake‑prone scripts.
This returns a meaningful value from the first bar onward.