However, these methods are estimated according to sample variance and covariance estimators of returns.
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。
Populations, random samples. Sample statistics, moments of the sample mean and variance.
母体, 随机样本。 样本统计, 样本平均数和变异数的动差。
According to data provided by doctor, under the assumption that sample is normal, performed frequency analysis, pair test and variance analysis.
针对医生提供的数据,在样本服从正态分布的假设下,进行了频数分析、配对检验和方差分析。
That is the sample variance.
这就是样本方差
There's also another variance measure, which we use in the sample-- There's also another variance measure, which is for the sample.
还有另一个离散指标,我们用以考察样本,这是另一个离散指标,用于考察样本
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