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The 10 Power Principles of Successful Trading Systems
by Markus Heitkoetter - Apr 29, 2005Principle #9: Look for a system that is tested on at least 200 trades
The more trades you use in your backtesting (without curve-fitting), the higher the probability that your trading system will succeed in the future. Look at the following table:

The more trades you have in your backtesting, the smaller the margin of error, and the higher the probability of producing profits in the future.
Principle #10: Chose a valid backtesting period
I recently saw the following ad: "Since 1994 I've taught thousands of traders worldwide a Simple and Reliable E-Mini trading methodology".
That's very interesting, because the e-mini S&P was introduced in September 1997, and the e-mini Nasdaq in June 1999, therefore none of these contracts existed before 1997. What kind of e-mini trading did this vendor teach from 1994-1997???
The same applies to your backtesting: If you developed an e-mini S&P trading strategy, then you should backtest it only for the past 2-4 years, because even though the contract has existed since 1997, there was practically no one trading it (see chart below):

Now you should have working method for separating the good trading system from the poor one. By applying this checklist you will easily identify trading systems that work and those that will never make it.
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