overfitting

Optimising vs Overfitting: The Hidden Danger in Backtesting

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Two computer monitors showing stock charts: left with a clear upward trend, right with erratic, noisy movement

Backtesting is a critical tool for traders to evaluate strategies using historical data, helping identify weaknesses and refine approaches. However, distinguishing between optimisation, which enhances strategy logic, and overfitting, which skews results to past data, is essential. Traders must ensure their strategies remain robust and adaptable for live market conditions.

Why Most Trading Strategies Fail Over Time

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Man sitting at desk reviewing trading checklist with financial charts on dual computer screens

This guide discusses the reasons trading strategies may fail over time, including changing market conditions, lack of clear definitions, and trader execution issues. It emphasizes the importance of understanding a strategy’s context, maintaining discipline, and conducting structured reviews rather than making impulsive changes during losing periods.