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I have a Regression Model with Train MAPE as 6% and Test MAPE as 15%. This appears to me as a clear case of over fitting. But can I still use this model assuming 15% Error is not a bad number after-all. Is this there a flaw in this thinking?

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  • $\begingroup$ it is overfitting, best would be to use k-fold cross-validation to test how much it overfits and decide $\endgroup$
    – Nikos M.
    Jan 5 at 14:43
  • $\begingroup$ What is the Baseline i.e. if humans can simply guess with a 20% error, so that would not be a great model? You must not simply accept it i.e. do detail causal of overfitting. If Train/Test is split on Time, then this might become 25% with new data $\endgroup$
    – 10xAI
    Jan 5 at 15:52
  • $\begingroup$ Why is it so clearly overfitting? The expectation should be for the training data performance to be superior to test data performance. $\endgroup$
    – Dave
    Jun 11 at 5:02
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Yes, assuming you haven't overfitted on the test set (which may happen after extensive hyperparameter optimization), you can assume that your model has a MAPE of 15%.

However, if you limit the overfitting, the test performance would probably go down!

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