3min chapter

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

Better System Trader

CHAPTER

Don't Override the Commands That Your Trading System Gives You

If you've developed a trading system by reusing the same out-of-sample data multiple times, it's almost certain that the reason it failed is because you have selected the luckiest system. In my experience, markets are a lot more stationary than people give them credit for. Do as much development as you possibly can before you touch that out- of- sample data Because it's valid only once.

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