[R] anova error
bbolker at gmail.com
Wed Dec 1 16:02:41 CET 2010
Peter Ehlers <ehlers <at> ucalgary.ca> writes:
> It might be a good idea not to use an outdated version of R.
> I don't see your "problem" in R 2.12.0.
> Peter Ehlers
> On 2010-12-01 05:44, Jean.Coursol <at> math.u-psud.fr wrote:
> > Just for fun
> > This small program gives negative Sum of Sq in anova (with R versions
> > 2.9.2 and 2.10.0) (linux 32 kernel 18.104.22.168-smp slackware 13.0) :
These are essentially just round-off error in a problem with zero
noise: there is absolutely no practical difference between 2e-16 and
2e16. If you really need to do something with these values that will
break if they are negative, see ?zapsmall ...
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