[R-sig-ME] how to get satterthwaite/Kenward-Roger degrees of freedom for heterogeneous-variance one-way ANOVA from an object of nlme::gls

[Rolf Turner]

On Wed, 16 Oct 2024 14:42:24 +0000
"Qiu, Weiliang /US via R-sig-mixed-models"
<r-sig-mixed-models using r-project.org> wrote:

> Greetings. I am using nlme::gls() to perform heterogeneous-variance
> one-way ANOVA and would like to get type III anova table.

<SNIP>

One should always think very carefully about what hypotheses are
actually being tested in a "type III analysis".  Such an analysis may
well be "meaningful" but the hypotheses being tested may not be of any
real interest. They involve taking averages of cell means over the
levels of factors and these averages may not describe anything
pertinent.

cheers,

Rolf Turner

-- 
Honorary Research Fellow
Department of Statistics
University of Auckland
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