R help - Feb 2005 - Need your help in calculating the p-value

Hi,

I am using R to perform wilcox.test and wondering if you know how the p-value in
wilcox.test is calculated?

Thank you for your help:-)

Regards,

Latha

Latha Raja wrote:
>Hi,
>
>I am using R to perform wilcox.test and wondering if you know how the
p-value in wilcox.test is calculated?
>  
>
You can get the source code of the wilcox.test function:

 > methods(wilcox.test)
[1] wilcox.test.default* wilcox.test.formula*

    Non-visible functions are asterisked
 > getAnywhere(wilcox.test.default)

...

You will see that it uses 'psignrank' (for the one sample case).


Christophe Pallier
www.pallier.org

See the details and references section of help("wilcox.test"). A small
section from the details might be relevant :

     By default (if 'exact' is not specified), an exact p-value is
     computed if the samples contain less than 50 finite values and
     there are no ties.  Otherwise, a normal approximation is used.

Also type in stats:::wilcox.test.default or getAnywhere
("wilcox.test.default") to see the actual codes.

Regards, Adai


On Wed, 2005-02-23 at 10:28 -0500, Latha Raja wrote:
> Hi,
> 
> I am using R to perform wilcox.test and wondering if you know how the
p-value in wilcox.test is calculated?
> 
> Thank you for your help:-)
> 
> Regards,
> 
> Latha
> 
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