Previously attainable fisher's exact test

On 13-Apr-11 17:40:53, Jim Silverton wrote:

I have a matrix say,

1  4
23  30

and I want to find the previously attainable fisher's exact test
p-value. Is there a way to do this in R?
-- 
Thanks,
Jim.

I do not understand what you mean by "previously attainable".

As far as that particular matrix is concerned, the fisher.test()
function will yield its exact Fisher P-value:

 M <- matrix(c(1, 4, 23, 30), byrow=TRUE, nrow=2)
 M
 #      [,1] [,2]
 # [1,]    1    4
 # [2,]   23   30
 fisher.test(M)
 #         Fisher's Exact Test for Count Data
 # data:  M 
 # p-value = 0.3918
 # alternative hypothesis: true odds ratio is not equal to 1 
 # 95 percent confidence interval:
 #  0.006355278 3.653391412 
 # sample estimates:
 # odds ratio 
 #  0.3316483

So the P-value is 0.3918 (as attained now, and as attainable
at any time previously if you had done the above ... !).