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SI234: Trend Followers are minnows, not whales ft. Rob Carver

Top Traders Unplugged

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Is the Back Test Really a Good Thing?

A back test serves different functions. It serves as a test of what happened in the past. For that you would ideally need to know what the commission was to trade S&P futures in 1982. But most retail traders don't have access to that level. So for the purposes of working out whether I should trade something now, what really matters is the current risk adjusted cost. Well, that's too high or too low. If you see something that's made a lot of money in the past and hasn't done recently, well, probably stay away from it.

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