[R-sig-ME] Negative estimates of variance component

[Ben Bolker]

  Pardon my asking, but why? For consistency with older (arguably less
correct) method-of-moments estimates that could give negative
estimates?

On Fri, Jul 30, 2010 at 1:32 AM, Chris Brien <Chris.Brien at unisa.edu.au> wrote:
> Dear mixed modellers,
>
> I have a data set that gives me an estimate of 0 for one of the variance components. I wanted to allow for the estimate of the component to be negative. My search of the documentation led me to believe that this is not possible. Am I right, or did I miss something?
>
> Cheers,
>
> Chris Brien
> -----
> University of South Australia
> ADELAIDE  5001  South Australia
> WEB page:  <http://people.unisa.edu.au/Chris.Brien>
>
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