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Practical Data
Science Cookbook
89 hands-on recipes to help you complete real-world data
science projects in R and Python
Tony Ojeda
Sean Patrick Murphy
Benjamin Bengfort
Abhijit Dasgupta
BIRMINGHAM - MUMBAI
Practical Data Science Cookbook
Copyright © 2014 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, without the prior written permission of the publisher,
except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the
information presented. However, the information contained in this book is sold without
warranty, either express or implied. Neither the authors, nor Packt Publishing, and its dealers
and distributors will be held liable for any damages caused or alleged to be caused directly or
indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies
and products mentioned in this book by the appropriate use of capitals. However, Packt
Publishing cannot guarantee the accuracy of this information.
First published: September 2014
Production reference: 1180914
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham B3 2PB, UK.
ISBN 978-1-78398-024-6
www.packtpub.com
Cover image by Pratyush Mohanta (
tysoncinematics@gmail.com
)
Credits
Authors
Tony Ojeda
Sean Patrick Murphy
Benjamin Bengfort
Abhijit Dasgupta
Reviewers
Richard Heimann
Sarah Kelley
Liang Shi
Will Voorhees
Commissioning Editor
James Jones
Acquisition Editor
James Jones
Content Development Editor
Arvind Koul
Technical Editors
Pankaj Kadam
Sebastian Rodrigues
Copy Editors
Insiya Morbiwala
Sayanee Mukherjee
Stuti Srivastava
Project Coordinator
Priyanka Goel
Proofreaders
Simran Bhogal
Maria Gould
Ameesha Green
Paul Hindle
Kevin McGowan
Lucy Rowland
Indexers
Rekha Nair
Priya Sane
Graphics
Abhinash Sahu
Production Coordinator
Adonia Jones
Cover Work
Adonia Jones
About the Authors
process optimization and over a decade of experience creating and implementing innovative
data products and solutions. He has a Master's degree in Finance from Florida International
University and an MBA with concentrations in Strategy and Entrepreneurship from DePaul
University. He is the founder of District Data Labs, a cofounder of Data Community DC, and is
actively involved in promoting data science education through both organizations.
First and foremost, I'd like to thank my coauthors for the tireless work they
put in to make this book something we can all be proud to say we wrote
together. I hope to work on many more projects and achieve many great
things with you in the future.
I'd like to thank our reviewers, specifically Will Voorhees and Sarah Kelley,
for reading every single chapter of the book and providing excellent
feedback on each one. This book owes much of its quality to their great
advice and suggestions.
I'd also like to thank my family and friends for their support and
encouragement in just about everything I do.
Last, but certainly not least, I'd like to thank my fiancée and partner in
life, Nikki, for her patience, understanding, and willingness to stick with
me throughout all my ambitious undertakings, this book being just one of
them. I wouldn't dare take risks and experiment with nearly as many things
professionally if my personal life was not the stable, loving, supportive
environment she provides.
Tony Ojeda
is an accomplished data scientist and entrepreneur, with expertise in business
University Applied Physics Laboratory, where he focused on machine learning, modeling
and simulation, signal processing, and high performance computing in the Cloud. Now, he
acts as an advisor and data consultant for companies in SF, NY, and DC. He completed his
graduation from The Johns Hopkins University and his MBA from the University of Oxford. He
currently co-organizes the Data Innovation DC meetup and cofounded the Data Science MD
meetup. He is also a board member and cofounder of Data Community DC.
Sean Patrick Murphy
spent 15 years as a senior scientist at The Johns Hopkins

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