Viju Moses,
Are you sure you got a P-value of 1.25  ?
Since P-value could only be between 0 to 1...

Tal





On Sat, Mar 21, 2009 at 9:17 PM, Viju Moses <vijumoses@gmail.com> wrote:

> Hi, I noted a discrepancy between R and openepi when I ran a fisher test
> with the same matrix. In R:
>
> > a=matrix(c(1,2,6,17), nrow=2)
> > a
>    [,1] [,2]
> [1,]    1    6
> [2,]    2   17
> > fisher.test(a, conf.int=T)
>
>       Fisher's Exact Test for Count Data
>
> data:  a
> p-value = 1
> alternative hypothesis: true odds ratio is not equal to 1
> 95 percent confidence interval:
>  0.02061498 31.73691924
> sample estimates:
> odds ratio
>  1.396646
>
> But in openepi the P value is 1.25. (In another instance too for other sets
> of data, I had got a p value of 1 in 3 instances for a prop.test when I got
> 3 other answers on a friend's stata software with the same data. )
>
> I'm using R on Ubuntu Intrepid. Is there anything I'm doing wrong? Any
> other packages I have to install?
>
> Thanks in advance
>
> Viju Moses
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



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