Survivorship Bias in Stock Data, Explained
Survivorship bias hides delisted and acquired tickers from most stock datasets. See the gap it opens in a backtest, and how to measure a full universe.
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Look-Ahead Bias: The Backtest Killer
Look-ahead bias is future data leaking into a backtest. See how same bar decisions, survivorship, and revised figures inflate results, and how to test for it.