Lookahead Bias
A backtest accidentally using information that wasn't available at decision time — computing today's signal with today's close, referencing revised data, or filling at prices the strategy couldn't have known. Even subtle lookahead can manufacture large fake edges, which is why engine-level guarantees beat manual care.
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Related terms
BacktestingSimulating a strategy's rules against historical market data to estima…Survivorship BiasTesting only on assets that still exist today, silently excluding the …
Backtests are hypothetical, computed by DeployQuant's engine on minute-resolution consolidated US market data (2021-01-04 to 2026-07-17, $10,000 starting capital, no margin, fees and slippage not modeled) and do not guarantee future results. Nothing on this page is investment advice. Live trading involves risk of loss.