[R-sig-Geo] variogram question

Paul Hiemstra p.hiemstra at geo.uu.nl
Wed Aug 20 23:15:23 CEST 2008


There will certainly be situations when the SS method will select an 
appropriate model. But there are also situations when it will not make a 
well thought over decision. For example if there is not a lot of data on 
short range variability the SS method will not be able to fit the model 
that shows the appropriate short range behaviour.

You spoke of more sophisticated methods of automatically choosing 
between models, what kind of methods did you have in mind?


G. Allegri schreef:
>> At this stage I do
>> this by computing the sums of squares between the model and the sample
>> variogram and choose the one with the smallest SS. This is a rather crude
>> way of selecting between the models.
> Thanks Paul for automap. I'm planning to try it in the next occasion.
> What are the major drawbacks in using simply SS in model selection? I
> mean, I know there are lot of more sofiticated methods, but is this
> good for some situation, or is in general a poor selection method?
> thanks,
> Giovanni

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