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df    =   [(v1/n1)  +  (v2/n2)]2
(v1/n1)2   +   (v2/n2)2
(n1-1)(n2-1)
where
  • df (t') are the number of degrees of freedom for the unequal variance t-test,
  • v1 and v2 are the sample variances,
  • n1 and n2 are the number of observations in 1 and 2