收入标准差
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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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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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