Re: [R] definition of variogram

From: Kang, Sang-Hoon <kangs_at_ornl.gov>
Date: Sat 25 Jun 2005 - 04:49:48 EST


Hi,  

Semi-variogram is defined as sum of observation difference between pairs of certain range of distance divided by 2N.  

            Gamma(h) = 1 / 2N(h) (Sum (z(u)-z(u+h))^2)  

You can take look 'GSLIB: Geostatistical Software Library and User's Guide' Oxford University Press (CV Deutsch & AG Journel).  

I'm new to R, so I don't really know spatial analysis package, but I'm sure there is. If not you can use GSLIB, which is almost as user-unfriendly as R - at least for me.  

Hope this helps.      

SANGHOON KANG, PhD

Microbial Ecology & Functional Genomics Group

Environmental Science Division

Oak Ridge National Laboratory

p.865.574.7321 f.865.576.8543

http://sanghoonkang.wo.to <http://sanghoonkang.wo.to/>

http://www.esd.ornl.gov/people/kang  

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