You might try pghyper() in the SuppDists package. It should give the same values for integer arguments.


Peter Dalgaard wrote:
Aurora Torrente <[EMAIL PROTECTED]> writes:


Hi all,

I have tried to compute a p-value for a hypergeometric distribution as:

dhyper(x,k,l,n) + phyper(x,k,l,n,lower.tail=FALSE)

and sometimes obtained negative values.  Do you know if it is because
a round error or am I doing something wrong?


Could you give us specific x,k,l,n where this happens, please. It
sounds like it shouldn't happen.



--
Bob Wheeler --- http://www.bobwheeler.com/
        ECHIP, Inc. ---
Randomness comes in bunches.

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