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Thread: Welch–Satterthwaite equation: proof or derivation?

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    Welch–Satterthwaite equation: proof or derivation?




    Hi,

    I'm studying now the Welch's t-test in which we use the Welch–Satterthwaite equation to calculate the degrees of freedom of the approxiamate chisquare distribution.

    However, I can't find a proof or derivation of this equation. Can you please suggest me a paper, site, or book where I can find it? I don't like using formulas without knowing how to prove them

    Thank you in advance

    Andrea

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    This set of lecture slides should help with that. Here ya go

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    Great! Thanks!

    You went through all the trouble of writing a lecture for me! That's so kind of you. I'll suggest this forum to all of my friends that study statistics!
    Last edited by advmc; 07-18-2010 at 11:28 AM.

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    Quote Originally Posted by advmc View Post
    Great! Thanks!

    You went through all the trouble of writing a lecture for me! That's so kind of you. I'll suggest this forum to all of my friends that study statistics!
    Ha. I'm not quite that awesome. Those slides are from a class I took. I probably should have mentioned that but oh well. The other lecture slides are here.

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