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

From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>
Date: Tue 15 Mar 2005 - 02:13:16 EST

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.

-- 
   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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Received on Tue Mar 15 02:23:48 2005

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