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185: How to avoid creating trading strategies that degrade quickly - Timothy Masters

Better System Trader

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Using Out-of-Sample Data to Compare John and Mary's Trading System

The performance of a trading system on out-of-sample data is the sum of two components. The other component that goes into that performance is luck. By definition, luck does not hold and when you put it into play, its performance is going to deteriorate. So what you are doing is getting some prejudice toward choosing the luckier system.

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