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1015
2005 May 17
0
problem with gls : combining weights and correlation structure
...rresponding to squared standard
error.
Variograms all shows a weak but real spatial autocorrelation (nugget ~ 0.9 but
they always increase with distance).
My first problem was the estimation of the parameters of the corStruc function
which were very far from their order of magnitude (range > 10E15, though the
maximum distance between observations is no more than 10E6).
I thought I had convergence problem that I could solve :
- with at first fitting corStruct functions to variograms with the solver of
Excel
- and secondly binding corStruct parameters to the obtained value with the
argument...