Returns the standard deviation of a numeric expression evaluated over a set (biased).

返回在某一集合上对数值表达式求得的标准偏差(偏置填充)。

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The risk of stock market refers to the possibility of security value loss and the deviation of real earnings from expected returns, which can be both earning deviation and capital loss.

证券市场风险是证券价值遭到损失的可能，实际收益对期望收益的偏离，这既可以是收益的偏离也可以是资产的损失等。

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December is also the least historically volatile month, with a standard deviation of returns of 3.17%.

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The last column in the table is also worthy of note, as it shows the standard deviation of returns.

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The standard deviation of returns for quadruple witching expiration weeks is only 2.2% which is considerably less than typical weeks, with a standard deviation of returns of more than 3%.

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