how to determine whether a model is optimal why use aic in model selection what value is used for er selection which aIC value is used to find the best model? when selecting a model how to use er how to choose the best model? why do i need a er of 2 how does aic work what model selection is used when considering the least likely model? what model is best what is aic when selecting model what er is used when a model is selected when to use aic in modelling how many variables does model selection have to consider when selecting a model a priori? when should i use aic to choose the optimal model why should i use aic in model selection how to calculate the evidence ratio for the best selection of models? why is model selection aic how to do model selection with aic how is er calculated with aic