(PR#7393) Re: [Rd] dhyper() does not allow non-integer values for

[tlumley at u.washington.edu]

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On Wed, 24 Nov 2004 Erik.Jorgensen at agrsci.dk wrote:

>
> dhyper() does not allow non-integer values for input parameters m and n.
>
> this is in contrast to the other functions in the _hyper() "family",

I would argue that the bug was in the other functions. If not, there is a=
=20
bug in the documentation, which gives no way to tell what the result=20
should mean for non-integer m, n, k.

 =09-thomas


>  # OK
>  dhyper(1,10,90,10)
>
>  # NaN
>  dhyper(1,10.5,90,10)
>
>  # OK
>  phyper(1,10,90,10)
>  phyper(1,10.5,90,10)
>
>  # OK
>  qhyper(0.71,10,90,10)
>  qhyper(0.71,10.5,90,10)
>
>  # OK
>  rhyper(1,10,90,10)
>  rhyper(1,10.5,90,10)
>
>
>
> # this "naive" version of dhyper() works
>
> dhyperx<-function(x,m,n,k,log=3DFALSE){
>       lp<-lchoose(m, x) + lchoose(n, k-x) - lchoose( m+n, k)
>       if (log) {lp} else {exp(lp)}
>       }
>
>  # OK
>  dhyperx(1,10,90,10)
>  dhyperx(1,10.5,90,10)
>
>
>
> Erik J=F8rgensen
> Danish Institute of Agricultural Sciences
>
>
>
> --please do not edit the information below--
>
> Version:
>  platform =3D i386-pc-mingw32
>  arch =3D i386
>  os =3D mingw32
>  system =3D i386, mingw32
>  status =3D
>  major =3D 2
>  minor =3D 0.1
>  year =3D 2004
>  month =3D 11
>  day =3D 15
>  language =3D R
>
> Windows XP Professional (build 2600) Service Pack 1.0
>
> Search Path:
>  .GlobalEnv, package:methods, package:stats, package:graphics,
> package:grDevices, package:utils, package:datasets, Autoloads, package:ba=
se
>
> ______________________________________________
> R-devel at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

Thomas Lumley=09=09=09Assoc. Professor, Biostatistics
tlumley at u.washington.edu=09University of Washington, Seattle
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