1.3 Summary

• Most statistical learning methods require data in a table format with multiple columns and rows.

• It’s important to be aware of the difference between a raw data table, and a clean table numerically codified.

• Unless otherwise specified, in this book we’ll assume that all the variables in a data matrix have numerical variables.

• For most of this book, we’ll consider a data set to be integrated by a group of individuals or objects on which we observe or measure one or more characteristics called variables.

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