Re: AI-GEOSTATS: indicator kiging (/variography) with trends

2008-04-09 Thread seba 

Hi
Well, with indicator a trend means (from my point of view) that there 
is some trend in the probability of occurrence
of a given category. If you use a ordinary kriging with a small 
neighbor search in some way you already
take into account the trend (i.e. with ok we assume that the mean 
proportion of a category changes smoothly with location).

S. T.


At 13.31 08/04/2008, you wrote:

Dear list,

It would be appreciated if someone guide me about how to deal with 
the problem of trend in indicator variography and kriging. For 
continuous variables, it is more or less clear how to remove such 
trends but for categorical variables, what can we do?



Regards
E. R. Khojasteh


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AI-GEOSTATS: Re: Adjusted ANOVA and power model, SAS PROC Mixed

2008-04-09 Thread Isobel Clark 
Tomas
   
  This is probably the model also known as the generalised linear:
   
  gamma(h)=nugget effect + slope x distance-to-a-power
   
  parameters are slope and power for distance. 
   
  I may be wrong!!
  Isobel
  http://www.kriging.com

tomas hlasny [EMAIL PROTECTED] wrote:
  Dear all,
I am calculating ANOVA adjusted for spatial autocorrelation using SAS 
Proc Mixed. It uses variogram to reduce the number of degrees of 
freedom. Can somebody help me, how to define a power model? Normaly, the 
parameters are sill, range (resp. scale), exponent and nugget 
respectively. However, as I found in SAS manual that power models is 
defined only using 2 params.
Can somebody help?
Thank`s a lot
Best regards
Tomas

Dr. TomᚠHlásny
NATIONAL FOREST CENTRE
Department of Ecology and Biodiversity of Forest Ecosystems
--
T. G. Masaryka st. 22, SK-96092 Zvolen
Slovak Republic
http://www.nlcsk.org/
phone: +421/45/532 03 16
fax: +421/45/531 41 92




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