标准差方差的方根 standard deviation
平方平均残差的平方根 root mean square residual
间期差值均方的平方根 root mean square of successive differences
标准差是方差的平方根。
方差的正的平方根叫做标准差。
The positive square root of the variance is called the standard deviation.
实验也证明，取样方差估计值的标准偏差与样本数目的平方根之积可近似为一常数。
It revealed that the product of the standard deviation of the estimated sampling variance and square root of the number of samples was a constant.
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