how is variance defined in krige {gstats}

Hi all,

from what I could devine (with the help of collegues) out of the gstat
documentation (should have looked at www.gstat.org earlier...) the
kriging variance (var1.var) is the kriging standard error ^2.

I am still trying to get Chiles (1999) as it will be able to enlighten
me on other things. Thanks Paul.

Cheers Herry


Dr Alexander Herr
Spatial and statistical analyst
CSIRO, Sustainable Ecosystems
Davies Laboratory,
University Drive, Douglas, QLD 4814 
Private Mail Bag, Aitkenvale, QLD 4814
 
Phone/www 
(07) 4753 8510; 4753 8650(fax)
Home: http://herry.ausbats.org.au
Webadmin ABS: http://ausbats.org.au
Sustainable Ecosystems: http://www.cse.csiro.au/
--------------------------------------------


-----Original Message-----
From: Paul Hiemstra [mailto:p.hiemstra at geo.uu.nl] 
Sent: Wednesday, December 06, 2006 6:51 PM
To: Herr, Alexander Herr - Herry (CSE, Townsville)
Cc: r-sig-geo at stat.math.ethz.ch
Subject: Re: [R-sig-Geo] how is variance defined in krige {gstats}

Dear Herry,

Details on kriging variance are given in several books on geostatistics.

For example the following book:

(Chiles1999) Chiles, J. & Delfiner, P. Geostatistics: Modeling Spatial
Uncertainty John Wiley & Sons, New York, 1999

A paragraph on the kriging variance is on page 176-177. How it is
calculated is explained in the parts that describe kriging. (e.g. p.
156).

hth,

Paul

Alexander.Herr at csiro.au schreef:

Hi list/Edzer,

I am trying to determine errors in the krige output and can't find any

documentation on the details of the variance output of krige {gstats} 
(variable var1.var of krige output).

How is this variance defined? Basically I am after a way to calculate 
other statistics like N, standard error, CV or a probability to 
describe the uncertainty of the krige output.

All help appreciated
Thanks
Herry


Dr Alexander Herr
Spatial and statistical analyst
CSIRO, Sustainable Ecosystems
Davies Laboratory,
University Drive, Douglas, QLD 4814
Private Mail Bag, Aitkenvale, QLD 4814
 
Phone/www
(07) 4753 8510; 4753 8650(fax)
Home: http://herry.ausbats.org.au
Webadmin ABS: http://ausbats.org.au
Sustainable Ecosystems: http://www.cse.csiro.au/

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Drs. Paul Hiemstra
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University of Utrecht
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