Re: [R] Bug? in summary( ) function base package

From: hadley wickham <h.wickham_at_gmail.com>
Date: Wed, 30 Apr 2008 13:12:51 -0500

On Wed, Apr 30, 2008 at 1:06 PM, Richard Saba <sabaric_at_auburn.edu> wrote:
> There seems to be an error in the summary() function when applied to "ts"
> class objects. The results of a call to summary( ), on the R "ts" data set
> USAccDeaths , reports the wrong value for Max. The value reported by the
> summary function is 11320. The max( ) function returns the correct value
> 11317, the July 1993 value. Coercing the data to a data.frame and calling
> summary returns the correct max value. A search of R -help found a post in
> 2007 that mentioned a problem but attributed it to rounding errors. But this
> is too large a difference to account for a simple rounding error.

Notice that all the numbers in :

> > summary(USAccDeaths)
> Min. 1st Qu. Median Mean 3rd Qu. Max.
> 6892 8089 8728 8789 9323 11320

have four significant digits and then carefully read the documentation for the digits argument of summary. That should suggest both the cause and a solution.

Hadley

-- 
http://had.co.nz/

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Received on Wed 30 Apr 2008 - 18:15:52 GMT

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