The ColumnTransformer allows us to easily apply different transformations to different features. For example, now we can scale some numerical features, while leaving binary flags alone! This article walks through two examples using...
We know to split our data into a training and a testing set before we do our preprocessing, let alone our modeling. Often we are not as careful when doing cross-validation; we should really do things like scale our data within cross-validation...
The principles of Hadley Wickham's tidy data, and how it relates to long and wide form data.
We show how to take an Excel spreadsheet, with merged column headings, and process it for further analysis.
What does it mean for data to be in long form vs wide form, and when would you use each? In Pandas, how do you convert from one form to another?