样本变异数 Sample Variance ; pattern variance
样本变异数函数 VAR
综合样本变异数 pooled sample variance
样本共变异数 sample covariance
样本间变异数 between-sample variance
样本变异系数 sample coefficient of variation
单项样本的变异数 variance of single sample
样本协变异数 sample covariance
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母体， 随机样本。 样本统计， 样本平均数和变异数的动差。
Populations, random samples. Sample statistics, moments of the sample mean and variance.
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然而，这些方法都是根据样本的变异数或报酬的共变异数估算的估计值。
However, these methods are estimated according to sample variance and covariance estimators of returns.
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