[R-sig-Geo] variogram parameters

[Ashton Shortridge]

Well,

all are very important for a good fit to your empirical semivariogram. Screw up 
one, and the curve won't be very close.

Maybe what you are looking for is, how to start developing a good model.

If so, I would say (based largely on experience teaching this):

1. anisotropy first. No point developing a crummy omnidirectional model
2. model form is next (spherical, exponential, etc)
3. nugget
4. sill and range

And iterate 2-4 until it seems ok. 

Others surely have their own preferences....

Yours,

Ashton

On Monday 21 June 2010 16:31:16 GEMA FERNANDEZ-AVILES CALDERON wrote:
> Dear list,
> 
> I have a trivial but not easy quiestion for me. In a semivariogram you use
>  this parameters:
> 
> a) partial sill
> b) nugget
> c) range
> d) anisotropy parameters
> 
> Please, could you ranking them beeing 1 the most important parameter?
> 
> Thank you very much,
> Gema
> 
> 	[[alternative HTML version deleted]]
> 
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-- 
Ashton Shortridge
Associate Professor			ashton at msu.edu
Dept of Geography			http://www.msu.edu/~ashton
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Michigan State University		fx (517) 432-1671