Thank you very much Ashton and Jaime. 
 
I am thinking about them. But I would like to construct a ranking for the importance of these parameters. 
 
 
Thank you again,
Gema

________________________________

De: Ashton Shortridge [mailto:ashton@msu.edu]
Enviado el: mar 22/06/2010 0:11
Para: r-sig-geo@stat.math.ethz.ch
CC: GEMA FERNANDEZ-AVILES CALDERON
Asunto: Re: [R-sig-Geo] variogram parameters



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
>
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>
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--
Ashton Shortridge
Associate Professor                     ashton@msu.edu
Dept of Geography                       http://www.msu.edu/~ashton
235 Geography Building          ph (517) 432-3561
Michigan State University               fx (517) 432-1671



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