Train/Test Split and Cross Validation in Python

Hi everyone! After my last post on linear regression in Python, I thought it would only be natural to write a post about Train/Test Split and Cross Validation. As usual, I am going to give a short overview on the topic and then give an example on implementing it in Python. These are two rather important concepts in data science and data analysis and are used as tools to prevent (or at least minimize) overfitting. I’ll explain what that is — when we’re using a statistical model (like linear regression, for example), we usually fit the model on a training set in order to make…