Book Image

Hands-On Data Preprocessing in Python

By : Roy Jafari
5 (2)
Book Image

Hands-On Data Preprocessing in Python

5 (2)
By: Roy Jafari

Overview of this book

Hands-On Data Preprocessing is a primer on the best data cleaning and preprocessing techniques, written by an expert who’s developed college-level courses on data preprocessing and related subjects. With this book, you’ll be equipped with the optimum data preprocessing techniques from multiple perspectives, ensuring that you get the best possible insights from your data. You'll learn about different technical and analytical aspects of data preprocessing – data collection, data cleaning, data integration, data reduction, and data transformation – and get to grips with implementing them using the open source Python programming environment. The hands-on examples and easy-to-follow chapters will help you gain a comprehensive articulation of data preprocessing, its whys and hows, and identify opportunities where data analytics could lead to more effective decision making. As you progress through the chapters, you’ll also understand the role of data management systems and technologies for effective analytics and how to use APIs to pull data. By the end of this Python data preprocessing book, you'll be able to use Python to read, manipulate, and analyze data; perform data cleaning, integration, reduction, and transformation techniques, and handle outliers or missing values to effectively prepare data for analytic tools.
Table of Contents (24 chapters)
1
Part 1:Technical Needs
6
Part 2: Analytic Goals
11
Part 3: The Preprocessing
18
Part 4: Case Studies

Types of data reduction

There are two types of data reduction methods. They are called numerosity data reduction and dimensionality data reduction. As their names suggest, the former performs data reduction by reducing the number of data objects or rows in a dataset, while the latter performs data reduction by reducing the number of dimensions or attributes in a dataset.

In this chapter, we will cover three methods for numerosity reduction and six methods for dimensionality reduction. The following are the numerosity reduction methods we will cover:

  • Random Sampling: Randomly selecting some of the data objects to avoid unaffordable computational costs.
  • Stratified Sampling: Randomly selecting some of the data objects to avoid the unaffordable computational costs, all the while maintaining the ratio representation of the sub-populations in the sample.
  • Random Over/Under Sampling: Randomly selecting some of the data objects to avoid the unaffordable computational costs...