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Refers to the variables used in a model to predict a response. This tag can also be used for $X$ variables in explanatory & descriptive modeling, not just predictive modeling. This same construct goes by many names in different contexts, including: independent variable, explanatory variable, regressor variable, covariate, etc. This tag can be used for any of these synonymous terms.
2
votes
Should I compare two models using AIC?
AIC looks at variance explained while penalizing complexity of model by number of features used.
If I'm understanding this correctly I think what you're seeing is when you merge the two the model is …