From lbaring@stochastik.uni-hannover.de  Fri Mar 24 12:23:25 2000
From: lbaring@stochastik.uni-hannover.de (lbaring@stochastik.uni-hannover.de)
Date: Fri, 24 Mar 2000 13:23:25 +0100 (MET)
Subject: [Rd] quantiles of the hypergeometric distribution (PR#502)
Message-ID: <200003241223.NAA02113@pubhealth.ku.dk>

Hello!

I use R-version 1.0.0
To get the 0.95 quantile of the hypergeometric
distribution with the parameters m=45000,n=5000 and
k=600 I use the R-command 

> qhyper(0.95,45000,5000,600).


The value obtained is 600. However, the true value
is 552. The latter can be obtained for example by
calling the corresponding distribution function 
with the R commands 

> x<-540:580
> phyper(x,45000,5000,600)   

The value 552 is obtained also by the usual normal
approximation.


Overall, it seems that R produces errors when calling
qhyper(p,m,n,k) for large values of the parametes 
m,n or k.

Sincerely
L. Baringhaus

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[Rd] quantiles of the hypergeometric distribution (PR#502)
lbaring@stochastik.uni-hannover.de