?round explicitly says:

Note that for rounding off a 5, the IEC 60559 standard is expected to be
used, ‘*go to the even digit*’. Therefore round(0.5) is 0 and round(-1.5)is
-2. However, this is dependent on OS services and on representation error
(since e.g. 0.15 is not represented exactly, the rounding rule applies to
the represented number and not to the printed number, and so
round(0.15, 1)could be either
0.1 or 0.2).

-- Bert

On Thu, Jan 3, 2013 at 9:44 AM, Christofer Bogaso <
bogaso.christofer@gmail.com> wrote:

> I happened to see these:
>
> > round(.5, 0)
> [1] 0
> > round(1.5, 0)
> [1] 2
> > round(2.5, 0)
> [1] 2
> > round(3.5, 0)
> [1] 4
> > round(4.5, 0)
> [1] 4
>
>
> What is the rule here?
>
> Should not round(.5, 0) = 1, round(2.5, 0) = 3 etc?
>
> Thanks and regards,
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

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