Algo & Quant traders

S&P did 140% since 2015.

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I assumed you base your system around backtests of previous market data which has always been going higher.

Yes I use previous market data. But there are ways to avoid producing a long bias in your strategies as a result. The fact my Beta is zero indicates I've probably managed this. And 80% of what I am trading isn't stocks anyway.

GAT
 
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