Is much of your time spent doing tedious tasks such as cleaning dirty data, accounting for lost data, and preparing data to be used by others? If so, then having the right tools makes a critical difference, and will be a great investment as you grow your data science expertise.

The book starts by highlighting the importance of data cleaning in data science, and will show you how to reap rewards from reforming your cleaning process. Next, you will cement your knowledge of the basic concepts that the rest of the book relies on: file formats, data types, and character encodings. You will also learn how to extract and clean data stored in RDBMS, web files, and PDF documents, through practical examples.

At the end of the book, you will be given a chance to tackle a couple of real-world projects.

What you will learn

Understand the role of data cleaning in the overall data science process

Learn the basics of file formats, data types, and character encodings to clean data properly

Master critical features of the spreadsheet and text editor for organizing and manipulating data

Convert data from one common format to another, including JSON, CSV, and some special-purpose formats

Implement three different strategies for parsing and cleaning data found in HTML files on the Web

Reveal the mysteries of PDF documents and learn how to pull out just the data you want

Develop a range of solutions for detecting and cleaning bad data stored in an RDBMS

Create your own clean data sets that can be packaged, licensed, and shared with others

Use the tools from this book to complete two real-world projects using data from Twitter and Stack Overflow

About the Author

Megan Squire

is a professor of computing sciences at Elon University. She has been collecting and cleaning dirty data for two decades. She is also the leader of FLOSSmole.org, a research project to collect data and analyze it in order to learn how free, libre, and open source software is made.

Table of Contents

Why Do You Need Clean Data?

Fundamentals – Formats, Types, and Encodings

Workhorses of Clean Data – Spreadsheets and Text Editors

Speaking the Lingua Franca – Data Conversions

Collecting and Cleaning Data from the Web

Cleaning Data in Pdf Files

RDBMS Cleaning Techniques

Best Practices for Sharing Your Clean Data

Stack Overflow Project

Twitter Project

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