标准差(StdDev)是用于判断趋势和市场波动性的技术指标。该指标衡量相对于移动平均的波动范围。标准差常用作其他技术指标的组成部分。
例如，在计算布林带时，你要将标准差的值加入移动平均。
市场在该指标值高时看作是波动的，此时价格远离移动平均。如果市场是平坦的，那么价格接近移动平均，这代表了低波动性。
价格易变的时期和平静的时期相继交替，因此标准差指标的分析策略也十分简单。如果指标值锅底，即市场平坦，那么你应该期待活动加剧。反之亦然，如果指标值显示非常高的值，那么市场很快就会归于平静状态。
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