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

[Chris Brien]

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
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University of South Australia
ADELAIDE  5001  South Australia
WEB page:  <http://people.unisa.edu.au/Chris.Brien>