[R] hypergeometric

Jarle Brinchmann
Wed, 03 Dec 2008 11:03:12 -0000

The dhyper etc deal with the hypergeometric _distribution_ while what
you appear to want have is the hypergeometric special function (the
connection is that the regular  hypergeometric function is the
generating function for the hypergeometric distribution if I recall
correctly).

Anyway, what you need, I believe, is the hypergeo library from CRAN.

                 Cheers,
                     Jarle.

On Wed, Dec 3, 2008 at 9:17 AM, Zakaria, Roslinazairimah - zakry001
<Roslinazairimah.Zakaria at postgrads.unisa.edu.au>
wrote:
> Hi,
>
>
>
> I hope somebody can help me on how to use the hypergeometric function.
> I did read through the R documentation on hypergeometric but not really
> sure what it means.
>
>
>
> I would like to evaluate the hypergeometric function as follows:
>
> F((2*alpha+1)/2, (2*alpha+2)/2 , alpha+1/2, betasq/etasq).
>
>
>
> I'm not sure which function should be used- either phyper or  qhyper or
> dhyper
>
>
>
> Where
>
> alpha <- .75; beta1 <- 7 ; beta2 <- 5.5;
>
> etasq <- ((beta1+beta2)/(2*beta1*beta2*(1-rho))) ^2
>
> betasq <-
> ((beta1-beta2)^2+4*beta1*beta2*rho)/(4*beta1^2*beta2^2*(1-rho)^2)
>
>
>
> Thank you so much for your help.
>
>
>
>
>
>
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>
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