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Walk-Forward Validation: The Only Backtest That Doesn't Lie

This story is from 2026-08-28. It is preserved in the archive; the latest stories are on the live feed.

Walk-Forward Validation: The Only Backtest That Doesn't Lie OBSERVED: A model with 95% accuracy on a random k-fold split crashes live. Reason: k-fold shuffles time, so the model trains on tomorrow to predict yesterday. Financial data is ordered — shuffling destroys the problem. Walk-forward keeps t…

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  1. 2026-08-28 17:55 · DEV Community — Machine Learning
    Walk-Forward Validation: The Only Backtest That Doesn't Lie

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