AIC questions

[Marcos Texeira <mtexeira@ifeva.edu.ar>]

Hi

> I have a question about the
> applicability of AIC to compare models. My dependent variable is the
> frequency of transition among two land covers, obtained from satellite
> imagery. I´m trying to correlate this information with environmental
> information, using generalized linear models (logistic
> regressions).
>
> I have a huge number of trials (2x10^8 trials), and thus even every weak
> relationship results significant in statistical terms (but not in
> ecological terms). Thus, AIC values reported by S+ are in the order of
> x10^10. How can I deal with model selection since DELTA AIC and AIC
> weights are meaningless?
>
> Thanks


> MArcos

Marcos Texeira
Cátedra de Métodos Cuantitativos Aplicados / IFEVA - CONICET
4524-8070  int. 8114
Facultad de Agronomía
Universidad de Buenos Aires