Walk-Forward Optimization in Quantitative Backtesting: Overcoming Curve Fitting [2026]
Date Published
1. The Seduction of Curve-Fitting
Why In-Sample Perfection Guarantees Live Failure
If you test 5,000 combinations of indicator parameters over five years of historical data, basic probability guarantees you will find a parameter set that produced an astronomical Sharpe ratio purely by luck.
When deployed with real money, market regimes shift and overfitted parameters collapse. Walk-forward testing is the institutional antidote.
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