[R-sig-Geo] Doubt gstat fitting

[Edzer Pebesma]

On 09/13/2011 10:59 AM, Pilar Tugores Ferra wrote:
> Dear list,
> 
> I am using fit.variogram funcion in gstat package, trying several least square fitting methods (method 1,2, 6 and 7) and at the same time I am using the "fit range option".
> 
> I was wondering if the mentioned weighted least square methods are still being applied?
> 
> Regarding fitting range the help of the function says:Because the help funcition says:
> 
> "This function uses the internal gstat (C) code, which interates over (a) a direct (least squares) fit of the partial sills and (b) an iterated search, using gradients, for the optimal range value(s), until convergence of after a combined step ((a) and (b)) is reached."
> 
> Does "direct (least squares)" mean that the function uses OLS or applies the corresponding fitting method (1,2,6 or 7)?
> 
It means "direct (ordinary or weighted least squares)"

> I appologise if it is a problem of not understanding well the language however I would appreciate someone that can clarify this.
> 
No problems; your question helped improving the documentation.

> Thanks in advance,
> 
>  
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> Pilar
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>  
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> Mª Pilar Tugores Ferrà
> 
> Instituto Español de Oceanografía
> 
> Centro Oceanográfico de Baleares
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> Muelle de Poniente s/n
> 
> 07015 Palma de Mallorca
> 
> Baleares, España
> 
> Telf.: (34) 971 133759
> 
>  
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de