[R-sig-Geo] krige.bayes output

[Paulo Justiniano Ribeiro Jr]

Dear Giovanna

For certain values of the Box-Cox transformation it is not possible to
compute kriging variances.
Therefore a measure of the uncertainty of the predictions is computed by
(Q3-Q1)/4
where Q3 and Q1 are the 3rd and 1st quartiles

best
P.J.


Paulo Justiniano Ribeiro Jr
LEG (Laboratório de Estatística e Geoinformação)
Universidade Federal do Paraná
Caixa Postal 19.081
CEP 81.531-990
Curitiba, PR  -  Brasil
Tel: (+55) 41 3361 3573
Fax: (+55) 41 3361 3141
e-mail: paulojus AT  ufpr  br
http://www.leg.ufpr.br/~paulojus

On Thu, 21 Jun 2007, giovanna jona lasinio wrote:

> Dear all,
> I'm running a bayesian kriging using krige.bayes in the geoR library.
> I'm using a linux machine with R 2.4. I'm running a chain of annual
> surfaces estimation and I'm using every year's output to build the prior
> for the next one through the function post2prior (always, geoR library).
> My predictive distribution is back-transformed (Box-Cox) from Gaussian
> (log transformation).
>
> My problem concerns the krige.bayes output, in the predictive list I
> find an element named uncertainty of the same length as my surface. I
> was not able to find any explanation of what is in it searching the help
> and the mailing list archive.
> Does anyone know what  is it?
>
> Best
> Giovanna Jona Lasinio
>
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