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( American Mathematical Society ) 'Backtest overfitting' is a dubious yet common practice in finance.Its perils are dissected in 'Pseudo-Mathematics and FinancialCharlatanism: The Effects of Backtest Overfitting on Out-of-SamplePerformance,' to appear in the Notices of the American Mathematical Society. The authors write: 'We strongly suspect that ... backtestoverfitting is a large part of the ...
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