Range expansion periods can be measured by requiring that the 10 bar ATR be some amount greater than the 50 period ATR.For example the 10 bar ATR must be 1.25 or more times the 50 period ATR.

• 波动区间扩张时期正好与波动区间收缩时期相反，这时我们要求10期ATR大于50期ATR，例如10期ATR大于等于50期ATR的1.；25倍。