Survivorship Bias
Testing only on assets that still exist today, silently excluding the delisted and bankrupt. A universe of current S&P 500 members backtested over 20 years overstates returns because the failures were removed. Index-tracking ETFs largely sidestep the issue; single-stock universes must handle it explicitly.
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Related terms
BacktestingSimulating a strategy's rules against historical market data to estima…Lookahead BiasA backtest accidentally using information that wasn't available at dec…
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.