[R] Round error?

[James MacDonald]

You are doing something wrong.The p-value should be calculated using
phyper alone.

HTH,

Jim



James W. MacDonald
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109
734-647-5623

>>> Aurora Torrente <aurora at ebi.ac.uk> 11/14/03 09:22AM >>>
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?

Thanks in advance,

        Aurora

______________________________________________
R-help at stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help