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Python Feature Engineering Cookbook

You're reading from   Python Feature Engineering Cookbook Over 70 recipes for creating, engineering, and transforming features to build machine learning models

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Product type Paperback
Published in Jan 2020
Publisher Packt
ISBN-13 9781789806311
Length 372 pages
Edition 1st Edition
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Author (1):
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Soledad Galli Soledad Galli
Author Profile Icon Soledad Galli
Soledad Galli
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Table of Contents (13) Chapters Close

Preface 1. Foreseeing Variable Problems When Building ML Models 2. Imputing Missing Data FREE CHAPTER 3. Encoding Categorical Variables 4. Transforming Numerical Variables 5. Performing Variable Discretization 6. Working with Outliers 7. Deriving Features from Dates and Time Variables 8. Performing Feature Scaling 9. Applying Mathematical Computations to Features 10. Creating Features with Transactional and Time Series Data 11. Extracting Features from Text Variables 12. Other Books You May Enjoy

Standardizing the features

Standardization is the process of centering the variable at zero and standardizing the variance to 1. To standardize features, we subtract the mean from each observation and then divide the result by the standard deviation:

The result of the preceding transformation is called the z-score and represents how many standard deviations a given observation deviates from the mean. In this recipe, we will implement standardization with scikit-learn.

How to do it...

To begin, we will import the required packages, load the dataset, and prepare the train and test sets:

  1. Import the required Python packages, classes and functions:
import pandas as pd
from sklearn.datasets import load_boston
from sklearn...
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