R Graph Essentials

David Alexander Lillis

• Publisher: Packt Publishing
• Year: 2014
• ISBN:
  9781783554553
• Edition: 1
• Topic: Computer Science
• Subtopic: Open Source Programming
• Index: Computer Science

R has undergone an explosion of popularity around the world. The wide range of graphs and options for creating high-impact visualizations makes R a highly effective tool for researchers, data analysts, students, and others.

This book starts with the basics of R and the principles of creating graphics, focusing on scatterplots and line graphs for research and data analysis.

After that you will learn how to include mathematical expressions on your graphs and create bar charts, histograms, boxplots, and so on using advanced functions. The book then dives deeper into shading and coloring your graphs and labeling points on graphs using the qplot function. After that you will learn how to use the ggplot package to control symbol color, size, shape, and many other attributes.

By the end of this book, you will have expert skills to create attractive and informative graphics and design professional-level graphs.

R Graph Essentials

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Table of Contents

R Graph Essentials

Credits

About the Author

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers, and more

Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Downloading the color images of this book

Errata

Piracy

Questions

1. Base Graphics in R – One Step at a Time

Learning basic graphics techniques

Creating and joining points

Creating scatterplots and line plots

Colors in R

Passing parameter values to titles and labels

Including a regression line

Graphing mathematical functions

R provides many options

Creating graphs with several curves

Customizing your axes

Creating axis labels

Creating multiple graphs on the same page

Saving your graphs

Including mathematical expressions on your plots

Summary

2. Advanced Functions in Base Graphics

Reading datasets into R

Including a regression line and residuals

A medical dataset to create graphs

Creating complex multiple axes

Superposing graphs

Creating point labels

Including a grid on your graph

Shading and coloring your graph

Using polygon() to shade under a normal curve

Creating bar charts

Including a legend

Creating histograms

Creating boxplots

Creating pie charts

Creating dotcharts

R's color palettes

Using smoothers on your graph

Creating scatterplot matrices

Writing functions to create graphs

Including error bars on your graph

Summary

3. Mastering the qplot Function

About qplot

The qplot syntax

Producing scatterplots using qplot

Subsetting your data before graphing

Mapping aesthetics to categorical variables

Controlling colors on your graph

Setting up graphs as objects

Creating facet plots

Creating line graphs using qplot

Creating multiple curves simultaneously

Including smoothed curves

Creating histograms with qplot

Creating facet plots for histograms

Creating kernel density plots

Creating bar charts

Creating boxplots

Creating graphs with dates

Summary

4. Creating Graphs with ggplot

Getting started with ggplot

Mapping color, shape, and size to a variable

Modifying the plotting background

Controlling the legend name and legend labels

Modifying the x and y axes

Creating attractive color schemes

Creating curves for each factor level

Creating histograms

Creating bar charts

Creating a stacked bar chart

Creating a grouped bar chart

Creating a faceted bar chart

Creating boxplots

Labeling points with text

Mapping color to text

Including regression lines

Summary

Index

R Graph Essentials

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 author, 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: 1150914

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78355-455-3

www.packtpub.com

Cover image by Arvind Shetty (<[email protected]>)

Credits

Author

David Alexander Lillis

Reviewers

Mzabalazo Z. Ngwenya

Donato Teutonico

Tengfei Yin

Commissioning Editor

Pramila Balan

Acquisition Editor

Reshma Raman

Content Development Editor

Akashdeep Kundu

Technical Editor

Rohit Kumar Singh

Copy Editors

Roshni Banerjee

Adithi Shetty

Project Coordinator

Kartik Vedam

Proofreaders

Simran Bhogal

Maria Gould

Ameesha Green

Indexer

Hemangini ...