[R-sig-Geo] about a variogram

[Tobias Vetter]

It would be another possibilty to convert the data into classes.
Simplest way:  0  if the species is missing and 1 if existing .
>
> Dear all,
>
>  
>
> I want to show this variograma to you and ask about the meaning.  
> These are data of abundance of a tree species in the forest. I took 
> the values (abundance = # individuals) and transformed this abundance 
> with root square (to minimize the variance) for each point. I have 520 
> point from the forest, many of them with zero because the species was 
> absent. This variogram means that there is no spatial pattern?. I 
> fitted this variogram with corSphere or corRatio models to get these 
> parameters, range and nugget. I choose a model with base on Akaike 
> Information Criterion (AIC). I would like to use these values (range) 
> for my results, but I do not known if I am doing right this. I just 
> want to hear your opinion.
>
>  
>
> Thanks a lot for your help
>
>  
>
> Mar
>
>
>
> -- 
> Marcia C. Muñoz
> Universidad de Puerto Rico
> Departamento de Biologia - FB246
> POBOX 23360
> San Juan, PR 00931-3360
> tel: 787-7640000, 2900
>
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