why is it better to use an estimator or additive modeling which estimator is best when it is additive? what is additive model which statement describes an equation that has an additive model which additive model is better? which model is easier to predict or estimate when it has a 2nd estimator what model is used to approximate a nonlinear model? which type of model is more efficient and less biased? what is the difference between additive and non-additive model which model is harder to predict which is best additive model which is easier to use additive or nonlinear model what is the optimum additive model? additive modelling vs linear model which is better additive modeling or nonlinear modeling what is additive model what's the additive modelling approach? which method best predicts the variance which additive model is best what is the additive model in math