Markets9 March 20264 min read

Backtesting 101: Why Most Backtests Lie

Survivorship bias, look-ahead bias, and overfitting — the three enemies of every backtester.

Every beginner builds a strategy that returns 200% in backtesting and 0% in live trading.

The problem is usually one of three biases: survivorship, look-ahead, or overfitting.

Here is how to avoid each one.

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Backtesting 101: Why Most Backtests Lie — QuantNull