Before running a backtest, apply these manual or scripted checks.
The strategy does not reference future data (e.g., using a future close price to trigger a buy signal today).
This comprehensive guide will teach you how to write, debug, and implement to ensure your trading strategies are mathematically sound and ready for live execution. 1. What Does "Verified" AFL Code Mean? amibroker afl code verified
A verified code ensures that signals are calculated using only bars up to the current index. Professionals use Ref(..., -1) carefully and validate through ExRem and trade list reviews.
Follow this professional framework to verify any AFL script before risking capital. Before running a backtest, apply these manual or
When you download a script claiming to be run it through this forensic checklist.
AFL can be executed in two modes, and confusion between them is the #1 source of unverified behavior. Professionals use Ref(
The most dangerous bug in algorithmic trading is look-ahead bias—when your code references future data that would be impossible to know in real-time trading. This results in "holy grail" backtests that fail miserably in live trading. The Culprits: Ref() and Zig()
This article was written by a systematic trading engineer with 12 years of Amibroker development experience. For a free checklist PDF of verified AFL coding standards, subscribe to our newsletter below.