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

Chapter 10: Data Cleaning Level II – Unpacking, Restructuring, and Reformulating the Table

In level I data cleaning, we were only concerned about the neat and codable organization of our dataset. As we mentioned previously, level I data cleaning can be done in isolation, without having to keep an eye on what data will be needed next. However, level II data cleaning is deeper. It is more about preparing the dataset for analysis and the tools for this process. In other words, in level II data cleaning, we have a dataset that is reasonably clean and is in a standard data structure, but the analysis we have in mind cannot be done because the data needs to be in a specific structure due to the analysis itself, or the tool we plan to use for the analysis.

In this chapter, we will look at three examples of level II data cleaning that tend to happen frequently. Pay attention to the fact that, unlike level I data cleaning, where the examples were merely a source of data, the examples...