[R] Sgeostat module

[Jens Nieschulze]

On Thu, 18 Oct 2001, Laurent Dubroca wrote:

> Dear Users,
> 
> I use Sgeostat to calculate co variogram (function est.variogram with two 
> variables).
> If i inverse the 2 variables in the functions, the co variogram change! 
> Normaly it is symmetric, isn't it?
not necessarily
have a look at "lag effects" 
supposedly described in Journal & Huijbregts, 1978, p.41
or in Goovaerts: Geostatistics for Natural Resources Evaluation, p.49

> Someone could me explain why, or give me an idea to calculate co variogram 
> in a easy way...
have you looked at GSLIB or GSTAT?

	J
> 
> Thanks in advance
> 
> Laurent
> 
> ps : sorry for my english
> 
> 
> Laurent William Dubroca
> Centre de Calcul de Chizé
> CNRS UPR 1934
> BP 14 - Villiers en Bois - 79360 Beauvoir sur Niort
> France
> Ph : +33-(0)549.099.603
> Fax : +33-(0)549.096.526
> 
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Jens Nieschulze

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