[R] Re: your mail

[Thomas Lumley]

On Fri, 29 Mar 2002, Chris Wen wrote:

> Hi,
>
> I am a newbie of R...
>
> What does the following message mean when I tried running a summary() on a
> dataset?
>
> Warning message:
> Integer overflow in sum(.); use sum(as.numeric(.))

It means that when calculating the sum of a set of integer values (as part
of calculating the mean) there was a numeric overflow -- the answer was
larger than 2^30 or about 1 billion. For large numbers you need to use
floating point rather than integer representation. You may want to convert
the offending column of your dataset to floating point with eg

dataset$variable<-as.numeric(dataset$variable)

	-thomas


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