Standard Deviation



英文名称:Standard Deviation 中文名称:标准差
"标准差是衡量一系列数值中某一数值与其平均值偏离程度的指标。它用于估算价格可能的波动程度,其数值与价格波动范围成正比。
e.g. The index is a weighted average of 85 existing monthly indicators of national economic activity, and is constructed to have an average value of zero and a standard deviation of one."