Book Image

R Data Analysis Cookbook - Second Edition

By : Kuntal Ganguly, Shanthi Viswanathan, Viswa Viswanathan
Book Image

R Data Analysis Cookbook - Second Edition

By: Kuntal Ganguly, Shanthi Viswanathan, Viswa Viswanathan

Overview of this book

Data analytics with R has emerged as a very important focus for organizations of all kinds. R enables even those with only an intuitive grasp of the underlying concepts, without a deep mathematical background, to unleash powerful and detailed examinations of their data. This book will show you how you can put your data analysis skills in R to practical use, with recipes catering to the basic as well as advanced data analysis tasks. Right from acquiring your data and preparing it for analysis to the more complex data analysis techniques, the book will show you how you can implement each technique in the best possible manner. You will also visualize your data using the popular R packages like ggplot2 and gain hidden insights from it. Starting with implementing the basic data analysis concepts like handling your data to creating basic plots, you will master the more advanced data analysis techniques like performing cluster analysis, and generating effective analysis reports and visualizations. Throughout the book, you will get to know the common problems and obstacles you might encounter while implementing each of the data analysis techniques in R, with ways to overcoming them in the easiest possible way. By the end of this book, you will have all the knowledge you need to become an expert in data analysis with R, and put your skills to test in real-world scenarios.
Table of Contents (14 chapters)

Labeling and legends

Labeling your graph is an important aspect of visualization, as the default variable names will not add clarity to the graph. ggplot has two ways to add labels and legends:

ggtitle(label): for adding the main title
xlab(label): for adding the x axis label
ylab(label): for adding the y axis label

You can also use the labs(...) method to add all of these--the main title, axis labels, and even legend titles. In this recipe, you will learn about adding labels and legends to your plot by adding extra layers to it.

Getting ready

If you have not done so already, make sure that the ToothGrowth.csv file is in the working directory of R. Then load the dataset and required packages:

> library(ggplot2)
> toothgrowth...