[R] p-value > 1

[Ista Zahn]

The maintainer's email address is listed in the package
documentation... as I think is the case with all CRAN packages.

-Ista

On Fri, Nov 13, 2009 at 11:20 AM, amor Gandhi <amorigandhi at yahoo.de> wrote:
> Thank you for your reply.
>
> The only contact address of the maintainer is
> http://www-stat.stanford.edu/~tibs/SAM
>
> However, one find no contact when one visit this page.
>
> I am not a mathematician, therefore, it is strange for me to get probability bigger that 1, if it is like that should I trust the p-value of 0.004332?
>
> Sorry for these questions.
>
> Best wishes,
> Amor
>
>
> --- Peter Dalgaard <p.dalgaard at biostat.ku.dk> schrieb am Fr, 13.11.2009:
>
> Von: Peter Dalgaard <p.dalgaard at biostat.ku.dk>
> Betreff: Re: [R] p-value > 1
> An: "amor Gandhi" <amorigandhi at yahoo.de>
> CC: r-help at stat.math.ethz.ch
> Datum: Freitag, 13. November 2009, 15:24
>
> amor Gandhi wrote:
>> Dear all,
>>
>> I am trying to use SAMr-library(samr), it gives me p-value = 1.001, any idea why?
>
> Well, the package maintainer might be a better place to ask. (Bring an example if you do.)
>
> However, as a generic matter, the result is obviously nonsensical, and could be due to a sloppy approximation of a distribution function, or maybe it is a (say) Bonferroni-adjusted p-value which is really an upper bound for the correct p-value.
>
> Notice, though, that you should only very rarely care about the exact p-value. As soon as it is above 0.1, the message is just that you have not proven that there is an effect.
>
> --    O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
>   c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
>  (*) \(*) -- University of Copenhagen   Denmark      Ph:  (+45) 35327918
> ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)              FAX: (+45) 35327907
>
>
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-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org