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Broken backtests leave quant researchers at a loss

As historical data loses relevance, quants must find new ways to validate their theories

Investment prospectuses famously contain the standard disclaimer that past performance is no guarantee of future returns. It’s a rider that is usually ignored – even by those in the industry.

“The truth is, most investors treat past performance as the one and only guide to future returns,” says Anthony Morris, who heads quantitative strategies at Nomura.  

Quant strategies in particular are

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