Survivorship Bias: Why Backtests Only See the Winners
A backtest on the current coin list ignores every dead coin. What Brown, Goetzmann, Ibbotson and Ross showed, with an example and a checklist.
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2 articles
Why Most Backtests Overstate Results
Three landmark papers explain why a great backtest is usually a statistical accident, and what to do: out-of-sample tests and a higher bar.