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单词 pooled estimate of variance
释义
pooled estimate of variance

Mathematics
  • If it is reasonable to assume that the variances of two populations that you wish to compare are equal, then the most discriminatory test available uses a single estimate of the common variance and uses all of the available data from the two samples. The pooled estimate sp is given by

    sp2=i=1nX(xix¯)2+j=1nY(yjy¯)2nX+nY2

    where {xi}, {yj} are the two sets of sample observations with sample sizes nX, nY respectively and sample means x¯,y¯.


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