[R] anova error

[Douglas Bates]

On Wed, Dec 1, 2010 at 9:02 AM, Ben Bolker <bbolker at gmail.com> wrote:
>
>
> 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 It might be a good idea not to use an outdated version of R.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 2.6.29.6-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.

Well, actually there is a big difference between 2e-16 and 2e16.  I
think you meant to write 2e-16 and -2e-16

> If you really need to do something with these values that will
> break if they are negative, see ?zapsmall ...
>
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