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2006 Jul 01
1
nlme: correlation structure in gls and zero distance
...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 470 geographical coordinates are repeated three
times (measurem...