Also, when using Backward Elimination Method, Forward Selection Method, or Stepwise Selection method this was the "best" model: All three of these methods were the same with a y-intercept (intercept, x1, x6, x9). The best method for AIC was the same except for no intercept (x1,x6,x9). This is what's confusing me; not sure why the intercept is left out for the models in AIC....
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