Differences in correlation structures are described and quantified.
Re-fitting Model 2 with different correlation structures (i.e., spatial autocorrelation functions and compound symmetry correlation structures) did not significantly improve model fit.
Details of these correlation structures are fully described in Pinheiro, Bates [69].
At the scale sampled, vegetation and soil properties did not display strong spatial correlation structures.
In addition, the GEE model with AR(1) correlation structures was well verified by the data.
Inconsistencies between the two correlation structures are analyzed by means of diagnostic indices.
Universal optimal block designs under general correlation structures are usually difficult to specify theoretically or algorithmically.
For these reasons, wavelet bases are suitable for representing permeability fields with non-trivial correlation structures.
The correlation structures between the variables differ for different spatial increments.
This is achieved by operating the CG algorithm over the modified correlation structures given by (36) and (37).
In practice, linear-phase FIR matched filter banks are also adopted as a choice to implement correlation structures.
