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22
votes
2answers
9k views

How should mixed effects models be compared and or validated?

How are (linear) mixed effects models normally compared against each other? I know likelihood ratio tests can be used, but this doesn't work if one model is not a 'subset' of the other correct? Is ...
0
votes
3answers
737 views

How to select best model out of linear, quadratic, and a model involving an exponential? Are the models nested?

I'm examining the growth rate of species en function of ion carbonate. For each specie, I have different measured of ion carbonate, it can be in different temperature or pH. For each measure, I'm ...
7
votes
1answer
1k views

Why do I get equal AIC, BIC and log likelihood for different models in LME framework?

I have two LME models with the same interaction, one containing both main effects and one containing only one main effect, say : $$ H\_CE = Season + Crownlevel + Season:Crownlevel , random = 1|...
39
votes
5answers
75k views

Negative values for AICc (corrected Akaike Information Criterion)

I have calculated AIC and AICc to compare two general linear mixed models; The AICs are positive with model 1 having a lower AIC than model 2. However, the values for AICc are both negative (model 1 ...