Take a look on this text:
http://thirteen-01.stat.iastate.edu/wiki//stat430/files?filename=wilcoxon_rank_sum-test.pdf

Maybe you should take a look on the Wilcox test in the coin package. As the
?wilcox.test says:

 See Also
wilcox_test<http://stat.ethz.ch/R-manual/R-devel/library/coin/html/LocationTests.html>
in
package coin for exact, asymptotic and Monte Carlo *conditional* p-values,
including in the presence of ties.


On Wed, Aug 17, 2011 at 9:40 AM, Ben Bolker <bbolker@gmail.com> wrote:

>  <bdeepthi <at> ibab.ac.in> writes:
>
> >
> > Hello,
> >
> > I have used Wilcox test to find the p-value for hgua95 spiken data. It
> did
> > not give the required result, and instead gave me warnings like the
> values
> > are duplicated. Kindly suggest me how to overcome this problem as I am
> new
> > to R.
>
>  Please read the posting guide (and <http://tinyurl.com/3jgynql>)
> and give us a reproducible example.
> We don't know what the "hgua95 spiken (?) data" is; we don't know what
> the "required result" is; presumably if you got warnings about duplicated
> values, then you had duplicated values in your data, either because
> they were really there or because the data got imported wrong or because
> it got mangled after you imported it ...
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Atenciosamente,

Raphael Saldanha
saldanha.plangeo@gmail.com

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