Hi Celia,
To compute the pseudo-cross covariance
for an unbounded model, you just substract the
semivariogram model g(h) from any positive value A,
such that A-g(h) is non-negative for all h.
The non-bias condition of the ordinary kriging system
allows the constant A to cancel out from the system
of equations, hence the choice of the value A has
no impact on the computation of kriging weights and
kriging variance.
Cheers,
Pierre
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On Tue, 22 May 2001, celia bulit wrote:
> Hi all:
>
> does anyone know how to calculate the "pseudo covariance function" for an
> unbounded semivariogram?
> Does it exist the funtion for S-Plus?
>
> thanks in advance
> Celia
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> Celia Bulit
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