[R] Dunnett's test

[Bob Wheeler]

Hsu gives Fortran routines for the critical
values. See http://www.stat.ohio-state.edu/~jch/

Peter Dalgaard BSA wrote:
> 
> kjetil halvorsen <kjetilh at umsanet.edu.bo> writes:
> 
> > > help.search("dunnett")
> > No help files found with alias or title matching `dunnett'
> >
> > so it seems like nobody have implemented this.
> >
> > for how to build it in R, see the " writing R extensions manual", and
> > look in ctest for examples of how to use
> > "htest". For writing dunnett.test, it will be a good idea to return the
> > result as a list with class "htest". Then the printing of the result
> > will be done
> > automatically.
> >
> > Kjetil Halvorsen
> 
> The real obstacle would seem to be the distribution of the many-one
> t-statistic. This doesn't seem to be available from any of the
> standard subroutine sources (apstat and toms). Miller's book cites the
> tables from a 1964 paper by Dunnett - I browsed through it earlier
> today and it seemed that the density can be calculated explicitly, but
> you need numerical integration to get the CDF. Anyone have a handful
> of spare evenings to code this up?
> 
> --
>    O__  ---- Peter Dalgaard             Blegdamsvej 3
>   c/ /'_ --- Dept. of Biostatistics     2200 Cph. N
>  (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
> ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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-- 
Bob Wheeler --- (Reply to: bwheeler at echip.com)
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