On Tue, 27 Feb 2001, Allyson Rosen wrote:
> I need to compare two means with unequal n's. Hayes (1994) suggests using a
> formula by Satterthwaite, 1946. I'm about to write up the paper and I can't
> find the full reference ANYWHERE in the book or in any databases or in my
> books. Is this an obscure test and should I be using another?
Perhaps it refers to:
F. E. Sattherwaite, 1946: An approximate distribution of estimates of
variance components. Biometrics Bulletin, 2, 110-114.
According to Casella & Berger (1990, pp. 287-9), "this approximation
is quite good, and is still widely used today." However, it still may
not be valid for your specific analysis: I suggest reading the
discussion in Casella & Berger ("Statistical Inference", Duxbury Press,
1990). There are more commonly used methods for comparing means with
unequal n available, and you should make sure that they can't be used
in your problem before resorting to Sattherwaite.
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