Pooled variance

In statistics, pooled variance (also known as combined, composite, or overall variance) is a method for estimating variance of several different populations when the mean of each population may be different, but one may assume that the variance of each population is the same. If the populations are indexed $i = 1,\ldots,k$ , then the pooled variance $s^2_p$ can be estimated by the weighted average of the sample variances $s^2_i$

单词	Combined variance
释义	Combined variance 英语百科 Pooled variance In statistics, pooled variance (also known as combined, composite, or overall variance) is a method for estimating variance of several different populations when the mean of each population may be different, but one may assume that the variance of each population is the same. If the populations are indexed $i = 1,\ldots,k$ , then the pooled variance $s^2_p$ can be estimated by the weighted average of the sample variances $s^2_i$
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Combined variance

Pooled variance