Abstract:
The aim of this study is to discuss a method for the
selection of parametric models of the moisture retention characteristic
MRC for natural soils. The author presents computational tools in S-Plus
for the adequate selection of these parametric models as non-linear regression
models (NLR-models) and this method of selection based on cross-validation
and bootstrap (re-sampling technique). Early, these current computational
tools were developed in some works about the selection of the nonlinear
regression models. The current results will be compared with the obtained
results which are based on the simulation studies and some calculations
of measures of nonlinearity in NLR models. Finally, the results indicate
to the best selected model which is identical with the selected model
by the simulation study and the calculation of the measures of nonlinearity.
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