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arafox
2006 Jul 01
1
nlme: correlation structure in gls and zero distance
...nsity over years in the
Doubs department. Measurements have been taken on 470 plots in March
each year and georeferenced. Average density is supposed to be different
each year.
In a first approach, I would like to use a general model of this type,
taking spatial correlation into account:
gls(IKAfox~an,correlation=corExp(2071,form=~x+y,nugget=1.22),data=renliev)
but I get
>
gls(IKAfox~an,correlation=corExp(2071,form=~x+y,nugget=1.22),data=renliev)
Error in getCovariate.corSpatial(object, data = data) :
Cannot have zero distances in "corSpatial"
I understand that the 4...