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7 years ago
Recognizing and Avoiding Overfitting, Part 1

 In my last two posts I described why overfitting predictive models is dangerous beyond the most obvious problem, namely that accuracy on new data is lower than expected. In the next few posts, I’ll describe how to recognized that overfitting may be occurring, and some common approaches to remove or mitigate the effects of overfitting.  OVERVIEW Overfitting is perhaps the most common and destructive problem in predictive modeling. It is common because predictive modeling is often an inductive, data-driven exercise where the data is king, as opposed to threads of statistical modeling where the model is king (terms

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