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单词 Sample Variance
释义

Sample Variance

To estimate the population Variance from a sample of elements with a priori unknown Mean (i.e.,the Mean is estimated from the sample itself), we need an unbiased Estimator for . This is thek-Statistic , where

(1)

and is the sample variance
(2)

Note that some authors prefer the definition
(3)

since this makes the sample variance an Unbiased Estimator for the population variance.

See also k-Statistic, Variance
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更新时间:2025/2/22 21:39:48