how to compare gls models can i compare two different gols models using aic in reml can I compare a gls model with a fixed effect in reml how to compare different model models can you compare model aic score in reml what are the variables in reml can gls model with fixed variables be compared how do i compare the gls models with different fixed variables why is it difficult to compare gls models can you do a gls aIC in reml which structure can be used as a model with fixed effects how do i compare models of different fixed and random variables why is aic score important how to compare different models in nlme gls what structure is used to compare different model what is the aic of the best model with gls can gls be compared with reml how to compare gls model why is aic different for gls can I compare a model and a fixed variable