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Hands-On Exploratory Data Analysis with R

By : Radhika Datar, Harish Garg

2.3 (3)

Hands-On Exploratory Data Analysis with R

2.3 (3)

By: Radhika Datar, Harish Garg

Overview of this book

Hands-On Exploratory Data Analysis with R will help you build a strong foundation in data analysis and get well-versed with elementary ways to analyze data. You will learn how to understand your data and summarize its characteristics. You'll also study the structure of your data, and you'll explore graphical and numerical techniques using the R language. This book covers the entire exploratory data analysis (EDA) process—data collection, generating statistics, distribution, and invalidating the hypothesis. As you progress through the book, you will set up a data analysis environment with tools such as ggplot2, knitr, and R Markdown, using DOE Scatter Plot and SML2010 for multifactor, optimization, and regression data problems. By the end of this book, you will be able to successfully carry out a preliminary investigation on any dataset, uncover hidden insights, and present your results in a business context.

Preface

Preface

Who this book is for

What this book covers

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Section 1: Setting Up Data Analysis Environment

Section 1: Setting Up Data Analysis Environment

Setting Up Our Data Analysis Environment

Setting Up Our Data Analysis Environment

Technical requirements

The benefits of EDA across vertical markets

Manipulating data

Installing the required R packages and tools

Summary

Importing Diverse Datasets

Importing Diverse Datasets

Technical requirements

Converting rectangular data into R with the readr R package

Reading in Excel data with the readxl R package

Reading in JSON data with the jsonlite R package

Getting data into R from web APIs using the httr R package

Getting data into R by scraping the web using the rvest package

Importing data into R from relational databases using the DBI R package

Summary

Examining, Cleaning, and Filtering

Examining, Cleaning, and Filtering

Technical requirements

About the dataset

Reshaping and tidying up erroneous data

Manipulating and mutating data

Selecting and filtering data

Cleaning and manipulating time series data

Summary

Visualizing Data Graphically with ggplot2

Visualizing Data Graphically with ggplot2

Technical requirements

Advanced graphics grammar of ggplot2

Installing ggplot2

Scatter plots

Histogram plots

Density plots

Probability plots

Box plots

Residual plots

Summary

Creating Aesthetically Pleasing Reports with knitr and R Markdown

Creating Aesthetically Pleasing Reports with knitr and R Markdown

Technical requirements

Installing R Markdown

Reproducible data analysis reports with knitr

Exporting and customizing reports

Summary

Section 2: Univariate, Time Series, and Multivariate Data

Section 2: Univariate, Time Series, and Multivariate Data

Univariate and Control Datasets

Univariate and Control Datasets

Technical requirements

Reading the dataset

Cleaning and tidying up the data

Understanding the structure of the data

Hypothesis tests

Tietjen-Moore test

Parsimonious models

Probability plots

The Shapiro-Wilk test

Summary

Time Series Datasets

Time Series Datasets

Technical requirements

Introducing and reading the dataset

Cleaning the dataset

Mapping and understanding structure

Hypothesis test

Grubbs' test and checking outliers

Parsimonious models

Bartlett's test

Data visualization

Summary

Multivariate Datasets

Multivariate Datasets

Technical requirements

Introducing and reading a dataset

Cleaning the data

Mapping and understanding the structure

Hypothesis test

Parsimonious model

Levene's test

Data visualization

Summary

Section 3: Multifactor, Optimization, and Regression Data Problems

Section 3: Multifactor, Optimization, and Regression Data Problems

Multi-Factor Datasets

Multi-Factor Datasets

Technical requirements

Introducing and reading the dataset

Cleaning the dataset

Mapping and understanding data structure

Hypothesis test

Grubbs test and checking outliers

Parsimonious model

Multi-factor variance analysis

Exploring graphically the dataset

Summary

Handling Optimization and Regression Data Problems

Handling Optimization and Regression Data Problems

Technical requirements

Introducing and reading a dataset

Cleaning the dataset

Mapping and understanding the data structure

Hypothesis test

Grubbs' test and checking outliers

Parsimonious model

Exploration using graphics

Summary

Section 4: Conclusions

Section 4: Conclusions

Next Steps

Next Steps

Technical requirements

What to learn next

Why R?

The data analysis workflow

Building a data science portfolio

Datasets in R

Getting help with exploratory data analysis

Summary

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Bartlett's test

Bartlett's test is useful when executing a comparison between two or more samples to specify whether they are taken from populations with equal variance. Bartlett's test works successfully for normally distributed data. This test includes a null hypothesis, with a calculation of equal variances, and the alternative hypothesis, where variances are not considered equal. This test is considered useful for checking the assumptions regarding variance analysis.

The user can perform Bartlett's test with the bartlett.test function in R. The normal syntax for this is as follows :

> bartlett.test(values~groups, dataset)

Here, the parameters refer to the following:

values: The name of the variable containing the data value
groups: The name of the variable that specifies which sample each value belongs to

If the data is in an unstacked form (with...

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