Book Image

R Graph Essentials

Book Image

R Graph Essentials

Overview of this book

This book is targeted at R programmers who want to learn the graphing capabilities of R. This book will presume that you have working knowledge of R.

Preface

What this book covers

What you need for this book

Who this book is for

Reader feedback

Customer support

Free Chapter

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

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

Learning basic graphics techniques

Creating and joining points

Creating scatterplots and line plots

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

2. Advanced Functions in Base Graphics

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

Including a grid on your graph

Shading and coloring your graph

Creating bar charts

R's color palettes

Using smoothers on your graph

Creating scatterplot matrices

3. Mastering the qplot Function

3. Mastering the qplot Function

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

4. Creating Graphs with ggplot

4. Creating Graphs with ggplot

Getting started with ggplot

Mapping color, shape, and size to a variable

Creating attractive color schemes

Creating curves for each factor level

Creating histograms

Creating bar charts

Creating boxplots

Labeling points with text

Including regression lines

Index

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Summary

In this chapter, we covered the basic syntax and techniques to produce graphs in R. We covered the essential details for creating scatterplots and line plots, and discussed a range of syntax and techniques that are useful for other kinds of graph. I hope that you found this chapter a useful start on graphing in R.

In the next chapter, we will cover a range of topics that you will need if you want to create professional-level graphs for your own research and analysis. It contains very useful material, so please continue to work through this book by making a start on the next chapter as quickly as possible. For example, in this chapter, though we saw how to draw a regression line, in the next chapter we will go a little further on the topic of graphing regression lines. However, the further chapters have many other interesting techniques for you to learn.