Book Image

Statistical Application Development with R and Python - Second Edition

Book Image

Statistical Application Development with R and Python - Second Edition

Overview of this book

Statistical Analysis involves collecting and examining data to describe the nature of data that needs to be analyzed. It helps you explore the relation of data and build models to make better decisions. This book explores statistical concepts along with R and Python, which are well integrated from the word go. Almost every concept has an R code going with it which exemplifies the strength of R and applications. The R code and programs have been further strengthened with equivalent Python programs. Thus, you will first understand the data characteristics, descriptive statistics and the exploratory attitude, which will give you firm footing of data analysis. Statistical inference will complete the technical footing of statistical methods. Regression, linear, logistic modeling, and CART, builds the essential toolkit. This will help you complete complex problems in the real world. You will begin with a brief understanding of the nature of data and end with modern and advanced statistical models like CART. Every step is taken with DATA and R code, and further enhanced by Python. The data analysis journey begins with exploratory analysis, which is more than simple, descriptive, data summaries. You will then apply linear regression modeling, and end with logistic regression, CART, and spatial statistics. By the end of this book you will be able to apply your statistical learning in major domains at work or in your projects.
Table of Contents (19 chapters)
Statistical Application Development with R and Python - Second Edition
Credits
About the Author
Acknowledgment
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
Index

Chapter 4. Exploratory Analysis

Tukey (1977) in his benchmark book Exploratory Data Analysis, abbreviated popularly as EDA, explains the best about the "best methods" as:

We do not guarantee to introduce you to the "best" tools, particularly since we are not sure that there can be unique bests.

The goal of this chapter is to emphasize on Exploratory Data Analysis (EDA) and its strength.

In the previous chapter, we have seen visualization techniques for data of different characteristics. Analytical insight is also important and this chapter considers EDA techniques. Furthermore, the more popular measures include the mean, standard error, and so on. It has been proved many times that mean has several drawbacks; one being that it is very sensitive to outliers/extremes. Thus, in exploratory analysis the focus is on measures that are robust to the extremes. Many techniques considered in this chapter are discussed in more detail by Velleman and Hoaglin (1981), and an e-book has been kindly made available...