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How do you calculate the degrees of freedom for unequal sample sizes and unequal variance (independent t test)

  • statistics - ,

    Degrees of freedom for unequal sample sizes and unequal variances =

    (s1^2/n1 + s2^2/n2)^2
    -----------------------------
    (s1^2/n1)^2/(n1-1) + (s2^2/n2)^2/(n2-1)

    Note: ^2 means squared.

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