Re: [R] Question about Tukey HSD (stat package)

From: JRG <loesljrg_at_verizon.net>
Date: Tue 15 Mar 2005 - 05:49:32 EST

On 14 Mar 2005 at 16:13, Peter Dalgaard wrote:

> Alice Le Bars <alice.le-bars@nantes.inserm.fr> writes:
>
> > Dear all,
> >
> > I would be glad if someone could tell me if Tukey HSD (function of
> > stats library) accept the NA values and could correct the unbalanced
> > design (different number of sample in each group)
>
> I don't think the *theory* of the HSD allows this. There is some more
> or less well-founded speculation that if the imbalance is not too bad,
> then the HSD results are somewhat useful anyway, but please consider
> using the multcomp package, which is specifically designed to get
> these things right.
>

I believe that Hayter (JASA, 1984, 12, 61--75) proves that the so-called Tukey-Kramer method is guarnateed to be conservative for any set of cell sizes --- under the usual ANOVA model, of course.

---JRG
> --
> O__ ---- Peter Dalgaard Blegdamsvej 3
> c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
> (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
> ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907
>
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John R. Gleason

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