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1.The s.d. is the standard deviation, which measures how much a set of values deviates from the mean.
s.d.是标准差，它衡量一组值与均值的偏差程度。
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2. In statistics, the s.d. is often used to describe the spread of data points around a central value.
在统计学中，s.d.常用来描述数据点围绕中心值的分布范围。
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3. The s.d. can be calculated using various statistical software programs.
可以使用各种统计软件程序来计算s.d.。