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海龟交易法则的近期偏好指的是什么?交易者们常常犯近期偏好的毛病,短期测试的问题,市场在这段较短的时间内,可能仅出现了一两种状态,比如如果市场一直处于稳定波动的状态,那么均值回归和反趋势策略的效果会非常好,但如果市场状态改变了,你所测试的方法可能就不再那么有效了,所以你的测试方法必须尽可能的提高你所测试的样本,对未来的才更有代表性。一套交易系统至少要测试10年以上的高精度历史数据才具有实战意义。

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