Methodology
Backtesting without look-ahead bias
Why every MarketLens backtest only uses data that existed at each forecast date.
12 Oct 2026 · MarketLens Editorial
Market insights
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Clear, practical guides to the indicators and concepts behind every MarketLens forecast.
Forecasting
Backtesting Done Right: Walk-Forward Testing Without Look-Ahead Bias
Why random splits cheat on time series, and how chronological testing gives honest error estimates.
12 Oct 2026 · MarketLens Editorial