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Re: [S] strange p-value for Fisher exact's test

To: Patrick Connolly <PConnolly@grunt.marc.cri.nz>
Subject: Re: [S] strange p-value for Fisher exact's test
From: Anne York <york@orca.akctr.noaa.gov>
Date: Tue, 24 Mar 1998 14:48:04 -0800 (PST)
Cc: Arnold.Dekkers@rivm.nl, Snews <s-news@wubios.wustl.edu>
In-reply-to: <199803242116.JAA09821@grunt.marc.cri.nz>
Sender: owner-s-news@wubios.wustl.edu
Not a Pentium problem. These were run in Splus 3.4 on an SGI
with an Irix operating system:


> fisher.test(matrix(c(1,1,70,70),nc=2))

         Fisher's exact test 

data:  matrix(c(1, 1, 70, 70), nc = 2) 
p-value = 1 

alternative hypothesis: two.sided 

> fisher.test(matrix(c(1,1,71,71),nc=2))

         Fisher's exact test 

data:  matrix(c(1, 1, 71, 71), nc = 2) 
p-value = 1.0001 
alternative hypothesis: two.sided 


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Anne E. York
National Marine Mammal Laboratory
Seattle WA 98115-0070  USA
e-mail: york@orca.akctr.noaa.gov.us
Voice: +1 206-526-4039
Fax: +1 206-526-6615
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

On Wed, 25 Mar 1998, Patrick Connolly wrote:

> According to Arnold.Dekkers@rivm.nl:
> 
> |> Very strange enough I get the same result als marcia:
> |> 
> 
> |> * and from Version 3.3 Release 1 for MS Windows 3.1 : 1995
> |> 
> |> under Windows NT on a Acer with Pentium processor.
> |> 
> |> So, what's going on ? Are the S-PLUS results machine dependent ??
> 
> Could this be another undocumented Pentium bug?  Has anyone tried it
> using a good old 486 processor, or any of the Cyrix, IBM or AMD
> processors?
> 
> Patrick
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