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Variable selection is very important for multiple linear regression

Statistics Dec 29, 2021

Variable selection is very important for multiple linear regression. Can we use MSE of train data to measure the performance of the final model?

 

I. Yes. MSE measures the difference between real Y and predicted Y

II. No. Should use the R-square of Model in Train

III. We CANT use R-square

IV.  No, only the test error can evaluate the performance of the final model

 

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