[R] hypergeometric vs fisher.test

[Andrea Franceschini]

Dear R team,
I have a simple question.

I tried this command:
phyper(17,449,19551,181, FALSE)
[1] 1.47295e-07

and then I tried this command:
(fisher.test(matrix(c(17,449,181,19551),2,2),
alternative='greater'))$p.value
[1] 3.693347e-06


Shouldn't be identical the results of the two commands ?
What is the difference ?

Thx a lot
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