[R-sig-Geo] geoR

Ole F. Christensen olefc at daimi.au.dk
Fri Mar 4 18:53:01 CET 2005

Dear Anders

* The maximum likelihood estimate of the partial sill parameter sigmasq 
can be expressed explictly as function of the other covariance parameters.
Therefore parameter estimate for sigmasq is NOT found by numerical 
maximisation, and as consequence in likfit you cannot specify that that 
sigmasq should be within certain limits.

* The parameter estimate for the relative nugget tausq.rel is found by 
numerical maximisation. Therefore you can specify that this parameter 
should be within certain limits.



Anders Malmberg wrote:

> Hi,
> A quick question on the likfit routine in the geoR package.
> It is not possible to bound both tausq.rel and sigmasq. If both of them
> are unknown the optimization is carried out wrt tausq.rel
> and sigmasq is not considered in the optimization. Correct?
> bon weekend.
> best regards,
> Anders Malmberg
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Ole F. Christensen
BiRC - Bioinformatics Research Center
University of Aarhus

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