Message-ID: <49A40B23.4050800@uni-muenster.de>
Date: 2009-02-24T14:58:43Z
From: Edzer Pebesma
Subject: Iteratively Reweighted Generalized Least Squares IRWGLS
In-Reply-To: <e06a91f30902240635w370a6820m995ac794434ce890@mail.gmail.com>
Faye Anderson wrote:
> Hi All,
> I think sgeostat function fit.variogram does it.
>
No, it does not quantify the correlations between variogram estimates,
so you'd better forget about the "Generalized" -- just look at the
output of variogram() that it reads; also the reweighting is only used
when you ask for it; it's a rather problematic feature IMO, as you'd
change the definition of the thing you optimize while you're optimizing
it...
In your original question you forgot to mention that you meant IRWGLS
for variogram model fitting.
--
Edzer
> Thanks.
> Faye
>
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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.springer.com/978-0-387-78170-9 e.pebesma at wwu.de