[R] exact values for p-values

From: S.O. Nyangoma <S.O.Nyangoma_at_amc.uva.nl>
Date: Wed 13 Jul 2005 - 19:06:05 EST


Hi David, Since I am looking at very extreme values, it appears I will need FMLIB. Is it an R lib? if so which version? How/where can I download it?

Regards.

> > This is obtained from F =39540 with df1 = 1, df2 = 7025.
> > Suppose am interested in exact value such as
> >
>
> If it were really necessary, you would have to move to multiple
> precision. The gmp R package doesn't seem to yet cover this, but
> FMLIB(TOMS814, DM Smith) is a multiple precision f90 library that
does
> include the incomplete beta -- it allows one to say for
> F(1,7025)=39540,P=6.31E-2886 (evaluated using 200 sign. digit
> arithmetic). Results from
> R's pf() agree quite closely with the FMLIB results for less
> extreme values
> eg
> > print(pf(1500,1,7025,lower=FALSE), digits=20)
> [1] 1.3702710894887480597e-297
>
> cf 1.37027108948832580215549799419452388134616261215463681945E-297
>
>
> | David Duffy (MBBS PhD) ,-
_|\
> | email: davidD@qimr.edu.au ph: INT+61+7+3362-0217 fax: -0101 /
> *
> | Epidemiology Unit, Queensland Institute of Medical Research
> \_,-._/
> | 300 Herston Rd, Brisbane, Queensland 4029, Australia GPG
> 4D0B994A v
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Jul 13 19:09:48 2005

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