Questions tagged [data-preprocessing]

For questions related to the concept of data pre-processing, which includes, for example, cleaning, instance selection, normalization, transformation, feature extraction or selection.

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Which of these two numerical methods for z-score normalisation is preferable, in multivariate linear regression?

In the exercise Exercise 3: Multivariate Linear Regression, by Andrew Ng, the author suggests to "scale both types of inputs by their standard deviations and set their means to zero". $$x_{n e w}=\...