OHLC Bar Permutation: How to confirm your trading system will work

Most systems don’t fail because markets are unpredictable. They fail because we mistake noise for signal.

Josh Malizzi1 min read·Just now

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“Permutation and Randomization Tests for Trading System Development” by Timothy Masters is one of those books that helps us understand that most trading systems do not fail because markets are unknowable. They fail because we fool ourselves during development.

If you are building systematic strategies, especially with multiple signals, filters, or ensemble methods, this is not just an abstract idea.

It is the difference between something that looks great in a backtest and something that survives live trading.

This post focuses on one of the most practical concepts from the book: OHLC bar permutation testing, and why it is one of the cleanest ways to answer the only question that really matters. Will this system actually work going forward?

Keep reading on Substack:

https://open.substack.com/pub/joshmalizzi/p/ohlc-bar-permutation-how-to-confirm?utm_campaign=post-expanded-share&utm_medium=web

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