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

Anne York (york@orca.akctr.noaa.gov)
Tue, 24 Mar 1998 14:48:04 -0800 (PST)


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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