Joris De Wolf a écrit :
Have you tried to define 'an' as a group? Like in
gls(IKAfox~an,correlation=corExp(2071,form=~x+y|an,nugget=1.22),data=renliev)
A small data set might help to explain the problem.
Joris
Thanks. Seems to work with a small artificial data set:
Dear listers,
I am trying to model the distribution of fox density 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
