[R] exact values for p-values - more information.
ramasamy at cancer.org.uk
Mon Jul 11 19:57:09 CEST 2005
Compare the following
t.test( 1:100, 101:200 )$p.value
t.test( 1:100, 101:200 )
In the latter, the print method truncates to 2.2e-16.
You can go as far as (depending on your machine)
before it becomes indistinguishable from zero.
But there are good reasons to truncate it at 2.2e-16 such as the
difficulty in trying to accurately estimate the extreme tail
On Mon, 2005-07-11 at 18:52 +0200, S.O. Nyangoma wrote:
> Hi there,
> If I do an lm, I get p-vlues as
> p-value: < 2.2e-16
> This is obtained from F =39540 with df1 = 1, df2 = 7025.
> Suppose am interested in exact value such as
> p-value = 1.6e-16 (note = and not <)
> How do I go about it?
> R-help at stat.math.ethz.ch mailing list
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
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