[R] Fisher's Exact Test

[partha_bagchi@hgsi.com]

Appology in advance if this has been asked and answered. I am getting different
answers using Fisher's exact test in the package ctest. For example:
x_cbind(c(8, 22), c(31, 29))
fisher.test(x)

    Fisher's Exact Test for Count Data 

data:  x 
p-value = 0.04024 
alternative hypothesis: two.sided 

However, in SAS or other packages on the net the answer I get is p-value=
0.02664.

Is this a result of the Clarkson, Fan & Joe (1993) improvement or am I doing
something fundamentally wrong?
(the above is only an example - I get different (from R) answers when I use 
different input matrices).

TIA.

Partha Bagchi. 

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