: RE: [ai-geostats] Re: Software for Automatic Semivariogram Estimation
It would be very nice if there would be a tutorial on
how to use the variogram modeler.
machnife
--- Pierre Goovaerts [EMAIL PROTECTED] wrote:
Hi Susan,
I would recommend the Stanford Geostatistical
Modeling Software (S
Hi all,
for S or R users, GeoR is worth a look for auto-fitting procedures. This
R package allows fitting of variograms (with the option of trend
removal) via least squares (equal weights, n_pairs weights, or 'Cressie'
weights), or computationally using maximum liklihood or REML. If you go
) 913-2201
http://home.comcast.net/~goovaerts/
From: Hohner, Susan [mailto:[EMAIL PROTECTED]
Sent: Tue 2/28/2006 1:28 PM
To: AI Geostats mailing list
Subject: RE: [ai-geostats] Re: Software for
Automatic Semivariogram Estimation
Yikes!
I
Hi AllIt is difficult to have an automaticbest fit semi-variogram until you define what you mean by "best fit". Noel Cressie's goodness of fit statistic goes a long way towards the ideal, but is very insensitive to changes in nugget effect and pretty insensitive to fairly large changes in the
Isobel Clark wrote:
Behrang
What weighting do you use in the weighted least squares?
Isobel
I have found choosing suitable weights always a frustrating
event. Cressie's weights, let's say N_h/[(gamma(h))^2], has
attractive properties, both intuitively and statistically. Here,
gamma(h) is
EdI use the Cressie statistic to four significant figures as a guide in the interactive fitting, but generally end up using a visual judgement. It tracks as you drag the model around, so you can watch it change.I think the 'real' visual objective function is probably the perpendicular (to
Geostats mailing list
Subject: RE: [ai-geostats] Re: Software for Automatic Semivariogram Estimation
Yikes!
I was working through the tutorial for the Geostatistical Analyst Extension
when this email discussion popped up. Any recommendations for a traditional
geostatistics software package
, 2006 9:53
PM
Subject: [ai-geostats] Re: Software for
Automatic Semivariogram Estimation
Behrang
What weighting do you use in the weighted least squares?
Isobel
http://www.kriging.comBehrang
Kushavand [EMAIL PROTECTED]
wrote:
hi,I
have a software for Variogram AUTO
