Message-ID: <4E6F4A97.6030101@uni-muenster.de>
Date: 2011-09-13T12:20:39Z
From: Edzer Pebesma
Subject: Doubt gstat fitting
In-Reply-To: <0838E01493845742A4D4039EA34EB1C1E116A5@ieopalma2.ba.ieo.es>
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,
>
>
>
> Pilar
>
>
>
>
>
> M? Pilar Tugores Ferr?
>
> Instituto Espa?ol de Oceanograf?a
>
> Centro Oceanogr?fico de Baleares
>
> Muelle de Poniente s/n
>
> 07015 Palma de Mallorca
>
> Baleares, Espa?a
>
> Telf.: (34) 971 133759
>
>
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>
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--
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of M?nster
Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics e.pebesma at wwu.de