On Wed, 26 Jan 2000, Lutz Prechelt wrote:
>
> Hi all,
>
> I am looking for S implementations of multivariate significance
> tests.
> Neither the S-Plus 5 manual, nor VR2, nor statlib appear to have
> any.
>
> Specifically, I need to test two bivariate samples for
> a difference in means. Both variables are from continuous
> distributions but one has a strong ceiling effect and the
> other I would rather also not trust to be normally distributed.
>
> Any hints, please?
> Thanks in advance
>
> Lutz
>
> Lutz Prechelt http://wwwipd.ira.uka.de/~prechelt/ | Whenever you
> Institut f. Programmstrukturen & Datenorganisation | complicate things,
> Universitaet Karlsruhe; 76128 Karlsruhe; Germany | they get
> (Phone: +49/721/608-4068, FAX: +49/721/608-7343) | less simple.
> >>> Ever had negative research results? http://wwwipd.ira.uka.de/fnr <<<
>
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The following paper gives several nonparametric procedures for
multivariate tests:
Friedman, JH and LC Rafsky (1979) Multivariate generalizations of
the Wald-Wolfowitz and Smirnov two-sample tests. Annals of Statistics,
vol. 7, p. 697.
Their tests are easy to implement in Splus using mstree.
Mario Cortina Borja e-mail: cortina@stats.ox.ac.uk
Department of Statistics TEL: (44)+(0)1865-272597 (direct)
University of Oxford (44)+(0)1865-272860 (secretary)
1 South Parks Road FAX: (44)+(0)1865-272595
Oxford OX1 3TG, UK WEB: http://www.stats.ox.ac.uk/~cortina
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